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  Smoking: Myth: Secondhand Smoke Is a Killer Page 2
Posted on Monday, October 23 @ 09:29:48 EDT by samantha
 
 
  USA
Letter Informing Anti-Smoking Groups of Their Misleading Claims About Secondhand Smoke Widely Disseminated; Now It's Time for Action




Read More:  Myth: Secondhand Smoke Is a Killer Page 3

Re: Combating Lysenko Pseudoscience 
27 October 2007

Kamal Chaouachi,
Researcher and Consultant in Tobacco Control
Paris, France
Send response to journal:
Re: Re: Combating Lysenko Pseudoscience
 
I wish to thank Pr Enstrom and inform him that I also shattered the “Lysenko pseudoscience” mirror in my field of research: hookah (shisha, narghile) smoking. Like him, I have been attacked for having questioned serious errors and flaws in many supposedly peer-reviewed studies. Strangely enough, these studies had remained uncommented, sometimes for years [1]. They culminated in the WHO (World Health Organisation) report on “waterpipe” tobacco smoking, the first ever published by this organisation [2]. I then learned that WHO is apparently facing serious problems as far as how recommendations and related reports are prepared [3][4].
Like Pr Enstrom, I have been attacked for being an “agent of the Tobacco Industry” and for a purported “conflict of interest” (see self-explanatory disclaimer further down). Above all, I was attacked for stating that there is a serious debate on the central role of nicotine in the dependence phenomenon” and that ongoing independent and rigorous research on cigarette smoking in general and on hookah smoking in particular is going to contribute to the collapse of the dogma of “nicotine addiction”[2]. For medical anthropologists who have been, like me, observing not “waterpipes” in laboratories but hookah, shisha and narghile smokers in the real daily life, in Asia and Africa, over the past ten years, it is in fact a truism. However, I am confident that cutting-edge psycho-pharmacological research will establish these facts very soon [5][6].
I have also been attacked for criticising methods to assess ETS (Environmental Tobacco Smoke)[7]. Paradoxically for many people, and to make it more complex, the hookah does not produce sidestream smoke. After the mainstream smoke has been thermodynamically filtered (low temperatures inducing peculiar chemical reactions, and then water bubbling), and filtered out again in the  user’s own lungs, the result is the clouds of smoke so familiar for whom knows the hookah scene. It is now clear for me that the world growing popularity of hookah smoking in the world (with thousands of hookah lounges which suddenly sprawled everywhere in the world in a few years) has sort of catalysed the drafting of bans on indoor-smoking: in the United Kingdom by last July [8] and one is scheduled for France by the beginning of next year. As in Pr Enstrom’s case, researchers should refrain from exaggeration and establishing unsupported relations.
Finally, as a lifelong non-smoker and researcher in this field, I do not think being “anti-tobacco” should be a condition to be scientifically fair. More, I see it as a major obstacle to the advancement of research. I am neither anti-tobacco nor pro-tobacco. I am for scientific truth.
Dr Kamal T. Chaouachi
Researcher and Consultant in Tobacco Control (Paris)
Teacher of a Comprehensive Course on Hookah (Narghile, Shisha) Smoking for French Doctors (University of Paris XI-XII)
References:
[1] Chaouachi K. The narghile (hookah, shisha, goza) epidemic and the need for clearing up confusion and solving problems related with model building of social situations. TheScientificWorldJOURNAL: TSW Holistic Health &Medicine 207 (7): 1691–6. DOI 10.1100/tsw.2007.255.
[2] Chaouachi K. A Critique of the WHO’s TobReg  “Advisory Note” entitled: “Waterpipe Tobacco Smoking: Health Effects, Research Needs and Recommended Actions by Regulators”. Journal of Negative Results in Biomedicine 2006 (17 Nov); 5:17.
http://www.jnrbm.com/content/5/1/17
[3] Oxman AD, Lavis JN, Fretheim A. Use of evidence in WHO recommendations. The Lancet Early Online Publication 2007 (9 May). DOI:10.1016/S0140-6736(07)60675-8
[4] Chaouachi K. Pessimism about a Possible Change in WHO Expert Recommendations. Comment: The Lancet Early Online Publication 2007 (24 May). http://www.thelancet.com/journals/lancet/article/PIIS0140673607606758/fulltext
[5] Dar R, Frenk H. Reevaluating the nicotine delivery kinetics hypothesis. Psychopharmacology (Berl). 2007 (May);192(1):1-7.
[6] Cohen C, Perrault G, Griebel G, Soubrié P. Nicotine-associated cues maintain nicotine-seeking behavior in rats several weeks after nicotine withdrawal:  Reversal by the cannabinoid (CB1) receptor antagonist, Rimonabant (SR141716). Neuropsychopharmacology. 2005, 30(1): 145-55.
[7] Chaouachi K. e-Letter to the Editor: “Measuring Real Exposure to Narghile (Hookah, Shisha) Smoke and Other Concerns Related to Public Health”. European Journal of Public Health 2006 (Jul 2). A critical analysis of  Tamim H, Akkary G, El-Zein A, El-Roueiheb Z, El-Chemaly S. Exposure of pre-school children to passive cigarette and narghile smoke in Beirut. European Journal of Public Health 2006 (May 4): 4 pages.
http://eurpub.oxfordjournals.org/cgi/eletters/ckl043v1#18
[8] Gatrad R, Gatrad A, Sheikh A. Hookah smoking. BMJ 2007 Jul 7;335(7609):20. See Rapid Response (15 Aug 2007): Hookah Smoking: A Few Comments on Some Errors and Misconceptions:
Read
________
Competing Interests:
No competing commercial interests, but co-inventor on patent application for a No-Carbon Monoxide harm reduction hookah. IMPORTANT NOTE: I signed away my past and future rights (total relinquishment) on this harm reduction patent by June 15, 2005, i.e. before its commercial exploitation. From that date, I have not had anymore any relation of any sort with the patent, even if the US patent still mentions my name on the internet. A legal document was signed on the same date in presence of a State Attorney in Paris (France).
Competing interests: None declared 
Read
Tobacco Control Activist Responds to Revelation of Incorrect Data on Website: I Don't Care; Anti-Smoking Group Apparently Decides to Retain Inaccuracy
October 25, 2007  By Michael Siegel
An anti-smoking activist has responded to my revelation on Monday of an incorrect (and blatantly false) assertion on a tobacco control web site by admitting that he really doesn't care. My email to him on Monday alerted him to the presence of this incorrect statistic on the SceneSmoking.org web site. His response: "I don't waste my time on you and your blog any more."
The anti-smoking group which is posting the incorrect information also doesn't appear to care about its accuracy. The organization responsible for this error - Breathe California of Sacramento-Emigrant Trials - has apparently decided to retain the mistake because after reading my email and the blog post on Monday, it has failed to correct the problem. As of the writing of this post, Breathe California of Sacramento-Emigrant Trails is still maintaining that smoking in movies "kills about 340 young people a day."
Read More
Reason Magazine
If You Can Smell It, It May Be Killing You
Jacob Sullum
October 17, 2007
Maverick anti-smoking activist Michael Siegel has published an article in the journal Epidemiologic Perspectives & Innovations in which he faults the tobacco control movement for misrepresenting the acute cardiovascular effects of exposure to secondhand smoke. Siegel, who supports government-imposed smoking bans in workplaces and agrees with his fellow activists that long-term exposure to secondhand smoke raises the risk of heart disease, criticizes them on his tobacco policy blog for claiming that even transient exposure might kill you. The journal article (which is available for free) gathers together some of the more egregious misrepresentations and explains why they are inconsistent with the scientific evidence. A sampling of the whoppers:
"Breathing drifting tobacco smoke for even brief periods can be deadly. For example, the Centers for Disease Controls [CDC] has warned that breathing drifting tobacco smoke for as little as 30 minutes (less than the time one might be exposed outdoors on a beach, sitting on a park bench, listening to a concert in a park, etc.) can raise a nonsmoker's risk of suffering a fatal heart attack to that of a smoker." [Action on Smoking and Health]
"After twenty minutes of exposure to secondhand smoke, a nonsmoker's blood platelets become as sticky as a smoker's, reducing the ability of the heart to pump and putting a nonsmoker at an elevated risk of heart attack." [SmokeFree Ohio]
"Just 30 minutes of exposure to secondhand smoke can greatly increase your risk of heart attack." [New York City Department of Health]
"Even a half hour of secondhand smoke exposure causes heart damage similar to that of habitual smokers." [Americans for Nonsmokers' Rights]
Siegel worries that "the dissemination of inaccurate information by anti-smoking groups...may harm the tobacco control movement by undermining its credibility, reputation, and effectiveness." He also argues that lying about health hazards "represents a violation of basic ethical principles that are a core value of public health practice [and] that cannot and should not be sacrificed, even for a noble end such as protecting nonsmokers from secondhand smoke exposure."
The headline of this post, by the way, appeared on a New York City subway ad sponsored by the Coalition for a Smoke-Free City back in the '90s. Although this sort of scaremongering has been going on for a while, the more recent examples decried by Siegel often include numbers, appeals to authority, and inapposite journal citations that enhance their pseudoscientific patina.
Read


New Journal Article Demonstrates Widespread Misrepresentation of Acute Cardiovascular Health Efffects of Secondhand Smoke by Anti-Smoking Groups

October 15, 2007
By Michael Siegel
An article that I published today in the journal Epidemiologic Perspectives & Innovations reveals that anti-smoking groups have been widely disseminating communications which misrepresent the acute cardiovascular health effects of secondhand smoke (see: Siegel M. Is the tobacco control movement misrepresenting the acute cardiovascular health effects of secondhand smoke exposure? An analysis of the scientific evidence and commentary on the implications for tobacco control and public health practice. Epidemiologic Perspectives & Innovations 2007; 4:12).

The article provides a comprehensive review of the scientific evidence relevant to the acute cardiovascular health effects of secondhand smoke. It then evaluates claims made by at least 100 anti-smoking groups that brief exposure to secondhand smoke causes a number of severe health effects - including atherosclerosis, reduced coronary artery flow, heart damage, heart disease, heart attacks, fatal and catastrophic arrhythmias, and strokes - in otherwise healthy individuals (those without severe, pre-existing coronary artery disease).

The article concludes that: "Based on the analysis, it appears that a large number of anti-smoking organizations are making inaccurate claims that a single, acute, transient exposure to secondhand smoke can cause severe and even fatal cardiovascular events in healthy nonsmokers. The dissemination of inaccurate information by anti-smoking groups to the public in support of smoking bans is unfortunate because it may harm the tobacco control movement by undermining its credibility, reputation, and effectiveness. Disseminating inaccurate information also represents a violation of basic ethical principles that are a core value of public health practice that cannot and should not be sacrificed, even for a noble end such as protecting nonsmokers from secondhand smoke exposure. How the tobacco control movement responds to this crisis of credibility will go a long way towards determining the future effectiveness of the movement and its ability to continue to save lives and protect the public's health."

Among the groups implicated in making inaccurate and/or misleading health claims are Americans for Nonsmokers' Rights (ANR), Action on Smoking and Health (ASH), Smoke-Free Ohio, the New York City Department of Health, the Montana Tobacco Advisory Board, TobaccoScam, and the Campaign for Tobacco-Free Kids (TFK).

The article goes on to explain that provision of accurate health information to the public is a core ethical principle of public health practice. The right of the public to accurate and non-misleading health information is supported by the Universal Declaration of Human Rights.

The paper's final conclusion is as follows:

"While there is ample evidence that chronic exposure to secondhand smoke increases the risk of cardiovascular disease, and therefore heart attack risk, and there is some suggestive evidence that acute exposure to secondhand smoke may present some degree of risk to individuals with existing severe coronary artery disease, there appears to be no scientific basis for claims that brief, acute, transient exposure to secondhand smoke increases heart attack risk in individuals without coronary disease, that it increases such risk to the level observed in smokers, that it can cause atherosclerosis, that it can cause fatal or catastrophic cardiac arrhythmias, or that it represents any other significant acute cardiovascular health hazard in nonsmokers."

"In light of this, the claims that are being widely disseminated by a large number of tobacco control groups appear to be scientifically unjustified and inaccurate."

"The dissemination of inaccurate information by anti-smoking groups to the public in support of smoking bans is unfortunate because it may harm the tobacco control movement by undermining its credibility, reputation, and effectiveness."

"While anti-smoking groups may provide a utilitarian-based argument that these inaccurate and/or misleading communications are doing more good than harm in the long run because they are helping to promote smoke-free policies which will protect the public's health and save lives, the problem is that even if this were true, disseminating inaccurate information represents a violation of basic ethical principles that are a core value of public health practice that cannot and should not be sacrificed. The ends do not justify the means, especially when those means are violating principles of autonomy and self-determination that form the essential bases for free societies. These are values which cannot and should not be trodden upon by public health organizations simply to promote a favored policy."

The Rest of the Story

The tobacco control movement now faces a crisis of its scientific credibility. Given the widespread misrepresentation of the science that has taken place, the public may now question even the valid aspects of the communications that the movement is disseminating.

As I stated in the article, I believe that "How the tobacco control movement responds to this crisis of credibility will go a long way towards determining the future effectiveness of the movement and its ability to continue to save lives and protect the public's health."

It is critical that the tobacco control movement and the organizations that have been implicated in this deception respond definitively to this crisis. Otherwise, my fear is that the public may "throw out the baby with the bath water."

In other words, I fear that the public does not have the ability to discern what communications are accurate and which are misleading. Rather than retaining respect for the scientific integrity of the tobacco control movement and simply acknowledging these misrepresentations as an isolated event, the public may well dismiss all statements that tobacco control organizations make.

If the tobacco control organizations involved, especially the leading groups such as Americans for Nonsmokers' Rights, TobaccoScam, the American Cancer Society, ASH, and the Campaign for Tobacco-Free Kids, respond definitively by apologizing for these misleading statements, correcting or clarifying them, and being more careful in the future, then I believe the deception that has occurred will eventually be forgotten.

However, if the organizations do not respond definitively, I fear that the reputation of the movement will be permanently tainted.

I should emphasize, however, that the reputation and future effectiveness of the movement is not my only concern. I believe that truth itself, and the ethical responsibility to provide accurate scientific information to the public, demand that tobacco control groups respond definitively in the way I describe above. It is not a game that we are playing. We have the responsibility to adhere to a certain ethical code of conduct in public health practice. We have veered off the path and are violating those core principles. It is time to get the movement back on track. The public has the right to accurate and non-misleading health information. I do not believe that we have a choice to make. We owe it to the public to do the right thing.
Read

IN MY VIEW: Discussion of Secondhand Smoke Health Effects Not Possible in Tobacco Control Movement

November 3, 2006
By Michael Siegel
That is the lesson that I have learned this week. You simply cannot challenge statements made about the health effects of secondhand smoke. Even if you are speaking from within the movement and have contributed a fair amount to that science. Even if advocates and groups continue to cite your own work widely, side by side with the alleged inaccurate or misleading claims.

Several months ago, a number of readers asked why I chose to write publicly about the misleading claims that anti-smoking groups are making, rather than keeping the information internal and confronting the organizations directly. Now you can see why the latter approach is of no use. The groups are simply not interested in hearing about it. They are not interested in discussing it. They are not interested in the strength of the documentation behind their claims.

You see - anything that interferes with the ability of the groups to wage their campaigns is viewed as an unnecessary distraction. Or worse, it is seen as heresy. I get attacked by colleagues every time I do something like this. To dare to challenge the statements that are being made by anti-smoking groups is simply not allowed. It doesn't matter whether there are strong scientific grounds for offering such a challenge. The challenge itself is viewed as inappropriate.

It still surprises me that months and months after having brought these issues to the attention of the tobacco control community, there is essentially no discussion of this issue within the movement. There's no interest in such a discussion and frankly, right now I don't think such a discussion is possible.

So does it make any sense for me to continue bringing these issues to the attention of groups that don't want to hear about it, or is it time to bring this to the public's attention instead?

Moreover, not a single anti-smoking group has corrected its statements in response to my pointing out their scientific inaccuracies. So what's the point of continuing to bang my head against the wall? At this point, I think it makes more sense to make my appeal directly to the public.

If I sound disappointed, it's because I am. If you were wondering why I didn't post for a day and a half, it's because I was distraught. It is not easy to continue pushing for scientific integrity in a movement that seems to have no interest in that. And to sustain personal attacks from colleagues every time I do speak out.

I've never seen anything like this. Even those who I would have considered "enemies" have always treated me with greater respect than many of my colleagues have over the past few months.

The funny thing is that if I were to put out a commentary tomorrow stating that the scientific evidence supports the contention that 30 minutes of secondhand smoke increases heart attack risk, it would make the rounds and would be disseminated widely throughout the movement by the end of the day. I've learned that it's not the quality of the science you produce that gains respect in this movement, it's how favorable your research is to the cause.

I'm not disappointed because I think I'm right in my questioning of these fallacious or misleading claims. I'm actually disappointed because I haven't been shown to be wrong. It's the silence on the substance of my scientific arguments that I find unacceptable. I'd love to be shown wrong in my arguments. At this point, I'd settle for any discussion of the scientific issues.

It's clear, however, that it will not happen. It isn't about the science, I've found out. It's about allegiance to the cause, in spite of the science.
Read


Letter Informing Anti-Smoking Groups of Their Misleading Claims About Secondhand Smoke Widely Disseminated; Now It's Time for Action

October 19, 2006
By Michael Siegel
I sent the following letter to my private secondhand smoke mailing list, consisting of a large number of anti-smoking groups involved in the secondhand smoke issue, many of which are making misleading and/or inaccurate claims about the health effects of secondhand smoke. Now we'll see what these groups are really made of. Will they correct their fact sheets to reflect the science, or will they intentionally retain their misleading claims to deceive the public?

The Rest of the Story will report early next week on whether any changes were made on the web sites of the organizations who received this letter.

To me, this is an important moment in the tobacco control movement. While I have been reluctant to, and have not yet, accused anti-smoking groups of intentionally misleading the public, failure to correct their communications knowing that they are wrong would constitute an intentional deception of the public. The response of anti-smoking groups to this letter will go a long way towards indicating the direction that the movement is headed.

Will we pride ourselves on our scientific integrity, or will we put the ends above the means and use unethical tactics to promote our agenda?

The Rest of the Story (The Letter)

There seems to be a great deal of confusion about some of the health effects of secondhand smoke, especially the acute cardiovascular effects of secondhand smoke, which is leading to a number of anti-smoking groups publicly making claims about the health risks of secondhand smoke that I'm afraid are misleading, and in some cases, inaccurate. The purpose of this note is to try to clarify some of this confusion. I realize that the scientific studies are very difficult to read and understand, so I'll try to explain the science as best I can.

First of all, to give you an idea of the kinds of misleading claims that are being made:

EXAMPLE 1: The August 30 press release of one anti-smoking group claimed: "Research studies have shown that even just thirty seconds of exposure to secondhand smoke can make coronary artery function of non-smokers indistinguishable from smokers." (see here for details)

This type of message is a problem, not only because it is inaccurate, but because it undermines the public's appreciation of the severe cardiovascular effects of smoking. If people really believe the statement, and therefore believe that chronic active smoking is no worse than a mere 30 seconds of exposure to secondhand smoke in terms of coronary artery function, then what reason is there for people to quit smoking? Obviously, people who are exposed to secondhand smoke for 30 seconds do not have the same damage to their coronary arteries as people who smoke actively for years. Even if this was just a mistake and it meant to say 30 minutes, it is still untrue that the damage to coronary artery function due to 30 minutes of secondhand smoke exposure is the same as the damage done by years of active smoking. I explain this fallacy in some detail below.

EXAMPLE 2: One major anti-smoking organization claims that: "Even a half hour of secondhand smoke exposure causes heart damage similar to that of habitual smokers. Nonsmokers' heart arteries showed a reduced ability to dilate, diminishing the ability of the heart to get life-giving blood." (see here for details)

This type of message is very dangerous - first, because it is fallacious; and second, because it undermines the risks of active smoking. It claims that the heart damage suffered by long-time smokers is no worse than that suffered by a nonsmoker exposed for just 30 minutes, which is completely ridiculous, but if believed, would suggest to a smoker that his or her smoking really wasn't all that bad.

EXAMPLE 3: A smoking ban manual put out by another anti-smoking group claims that: "Current scientific data suggest that eating in a smoky restaurant can precipitate myocardial infarctions in nonsmokers and increase the risk of fatal and non-fatal cardiac events in nonsmokers by about 30 percent." (see here for details)

By suggesting that eating out in a smoky restaurant increases the risk of heart disease by 30%, this message is not only inaccurate, but it also undermines the public's appreciation of the risks of smoking. If the risk of developing heart disease from active smoking is only as high as the risk a nonsmoker faces from eating out 4 times at a smoky restaurant (which this claim implies), then isn't a person better off actively smoking then being a nonsmoker and going out occasionally to a restaurant that allows smoking?

EXAMPLE 4: A large number of anti-smoking groups are claiming that secondhand smoke exposure causes pulmonary emphysema. For example, one group states that: "Secondhand smoke can cause the debilitating disease pulmonary emphysema, causing severe damage to the walls of the air sacs, with the lungs losing their capacity to expand and contract." (see here as well as here for details)

Unfortunately, there is simply not evidence to support such a claim at this time. Neither the incredibly comprehensive California EPA report nor the Surgeon General's report concluded that secondhand smoke causes emphysema. The Surgeon General's report actually concluded that the evidence is NOT sufficient to support a claim that secondhand smoke causes emphysema, and the California EPA report doesn't draw any such conclusion.

EXAMPLE 5: Many groups are claiming that 30 minutes of secondhand smoke exposure can cause atherosclerosis (hardening of the arteries), heart disease, or fatal or catastrophic arrhythmias, or that it can cause a heart attack in an otherwise healthy person. For example, one group claimed that: "Only 30 minutes of secondhand smoke exposure can cause narrowing of blood vessels, restricting the flow of blood and contributing to hardening of the arteries" and that "After 120 minutes of exposure, your heart rate variability is reduced, increasing the chance of an irregular heart beat that can itself be fatal or trigger a heart attack." (see here for details)

BRIEF SECONDHAND SMOKE EXPOSURE AND HEART DISEASE

The first thing that groups need to understand is that brief secondhand smoke exposure (such as 30 minutes, 2 hours, etc.) does not cause atherosclerosis, hardening of the arteries, or heart disease. These processes take many years to develop. Even among heavy smokers, we don't see evidence of any of these things until they reach at least 40 years old. In other words, it takes at least 20 years for the process of atherosclerosis to occur and for heart disease to develop. So 30 minutes of exposure does not cause narrowing of blood vessels. Such narrowing takes many years to happen.

So why are these "30 minute" claims being made? The confusion stems from a study that was published in JAMA in 2001 by Otsuka et al. These researchers found that 30 minutes of secondhand smoke exposure resulted in a decrease in something called coronary reserve flow velocity. This is a measure of the ability of the coronary arteries' ability to dilate under artifically induced conditions. A decrease in coronary reserve flow velocity indicates an impairment of the ability of the arteries to dilate, which indicates that endothelial dysfunction is taking place. Endothelial cells are the cells that line the inside of the coronary arteries. When they don't function properly, then the artery is not able to dilate normally in response to certain artifically induced stresses, and thus the measured reserve flow velocity is decreased.

However, it is important to realize that there is no clinical significance of the decrease in reserve flow velocity in terms of that single secondhand smoke exposure. The endothelial dysfunction is reversible, and if the person is not exposed again to secondhand smoke, there is no risk that the brief exposure will result in atherosclerosis. What the Otsuka study demonstrates is that if someone had chronic exposure to secondhand smoke, there is a plausible biologic mechanism by which that exposure could lead to atherosclerosis: namely, that continued endothelial dysfunction occurs. And endothelial dysfunction is an early precursor to atherosclerosis.

It is also critical to realize that a decrease in coronary reserve flow velocity does NOT mean that coronary blood flow is reduced in the individual. In fact, Otsuka et al. found that the basal coronary blood flow was unaffected by 30 minutes of exposure to secondhand smoke. Thus, the 30-minute exposure does not cause "heart damage," or diminish "the ability of the heart to get life-giving blood," as one anti-smoking group publicly claims.

In summary, then, there is no evidence that a 30 minute exposure to secondhand smoke can cause atherosclerosis, hardening of the arteries, narrowed arteries, or heart disease. In fact, it's biologically impossible for this to be the case, since it takes years and years for these processes to occur.

You should be aware that eating a hamburger also causes endothelial dysfunction and decreases coronary reserve flow velocity. But it wouldn't be accurate to claim that eating a hamburger causes narrowing of the coronary arteries, makes it harder for the heart to get life-giving blood, or triggers a heart attack.

BRIEF SECONDHAND SMOKE EXPOSURE AND FATAL ARRHYTHMIAS

Although a number of anti-smoking groups are claiming that just 2 hours of exposure to secondhand smoke can cause fatal or catastrophic cardiac arrhythmias, this is not the case - there is no evidence for this at all.

So why are these "2 hour" claims being made? The confusion stems from a study that was published in 2001 by Pope et al. The study found that after 2 hours of heavy secondhand smoke exposure, nonsmokers experienced something called decreased heart rate variability. There is some evidence that in people with severe heart disease, decreased heart rate variability may predispose to catastrophic arrthymias. However, in a healthy person, the observed effects of 2 hours of secondhand smoke exposure on heart rate variability are of no clinical significance. Like the Otsuka study, the importance of this study is that it demonstrates yet another plausible biologic mechanism by which chronic secondhand smoke exposure can cause heart disease. But it is absolutely false to claim that a 2 hour exposure to secondhand smoke causes fatal or catastrophic cardiac arrhythmias.

BRIEF SECONDHAND SMOKE EXPOSURE AND HEART ATTACKS

Although a very large number of anti-smoking groups are claiming that 30 minutes of secondhand smoke exposure can cause heart attacks in otherwise healthy people (they are not qualifying this claim by making it clear that it relates only to people with severe pre-existing coronary artery disease), this is also a false claim. There is simply no way (and no evidence) that a 30 minute exposure can induce a heart attack in a person who doesn't have severe coronary artery stenosis (narrowing) to begin with.

It is at least possible that if someone has severe coronary artery stenosis, a brief secondhand smoke exposure could be the final trigger that causes a heart attack, although there is really no evidence that this occurs in practice. If groups want to make such a claim, I don't think it is necessarily problematic, but it should be made very clear that the claim is only referring to people who already have severe heart disease. I myself wouldn't make such a claim because I don't think there is any evidence to support it in practice; however, it is at least a theoretical possibility, unlike any of the other above claims.

SECONDHAND SMOKE EXPOSURE AND EMPHYSEMA

Although many anti-smoking groups are claiming that secondhand smoke exposure causes pulmonary emphysema, the California EPA (which has been quite aggressive in its implication of secondhand smoke in various diseases - it concluded that secondhand smoke causes breast cancer above the objections of the American Cancer Society) did not even suggest that secondhand smoke causes emphysema. The Surgeon General's report concluded that there is not adequate evidence to make such a claim.

Perhaps my most detailed attempt to clarify these issues can be found here.

Why is this all so important?

First, because I think we have a responsibility to the public to be accurate in our scientific claims. We constantly criticize the tobacco companies for misleading the public with their health claims. To retain credibility and avoid hypocrisy, we should not be misleading the public with our own fallacious health claims.

Second, because we risk losing our credibility and therefore our effectiveness in promoting smoking bans if we are recognized as being untrustworthy in our public communications. The tobacco companies are avidly making note of all of the above misleading claims. These misleading claims are receiving public attention.

For example, just this past Friday, Jacob Sullum highlighted the 30-second claim on Reason Online's Hit&Run blog. A recent JAMA article highlighted some of these misleading claims. An op-ed I published in the St. Paul Pioneer Press also brought these issues to light.

I think we've got tremendous momentum in our efforts to protect the public from the hazards of secondhand smoke. And we've got the truth on our side. I think the truth is enough. I don't think we need to misrepresent the scientific evidence and exaggerate or sensationalize the health effects to make our point.

Ultimately, I think that by risking the credibility as well as scientific integrity of the entire smoke-free movement, we have a lot more to lose than any transient gains we may obtain by using these misleading claims to create more dramatic sound bites for the media and the public.
Read

Moment of Truth for Anti-Smoking Groups Has Arrived

October 23, 2006
By Michael Siegel
While the letter I sent out to my secondhand smoke mailing list went out to a large number of anti-smoking groups which have misleading or inaccurate health claims about secondhand smoke on their web sites, there are several sentinel groups that I will be watching with special interest. Each of these groups has been directly contacted and has been sent my letter, so their misleading claims have been brought directly to their attention.
Read

Anti-Smoking Groups Fail to Correct Misleading Statements about Effects of Secondhand Smoke

October 25, 2006
By Michael Siegel
Despite being informed that they were making misleading statements about the health effects of secondhand smoke, not a single one of the anti-smoking groups which received my letter has corrected its misleading claims.
Read

Anti-Smoking Advocates Told to Ignore the Science and Continue Making Absurd Health Claims; Rest of the Story Author Implored to Stop Speaking Out

October 25, 2006
By Michael Siegel
In a message sent to thousands of anti-smoking advocates on a major list-serve, a prominent leader of the anti-smoking movement (and my personal hero) implored these tobacco control advocates to simply ignore the scientific arguments that I'm making about why a number of claims about the acute cardiovascular effects of secondhand smoke are misleading or fallacious.
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Read More: Myth: Secondhand Smoke Is a Killer Page 1






 
 
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