Showing posts with label bacteria in cigarettes. Show all posts
Showing posts with label bacteria in cigarettes. Show all posts

Saturday, July 9, 2011

Teachable Moments in the Life of a Cigarette Smoker


Child surgery makes smoking parents more likely to try quitting.

Here’s a strange one: Doctors at Mayo Clinic wanted to find out whether children undergoing surgery had any effect on the smoking behavior of their parents. And it did—but the effect appears to be short-lived.

The Mayo researchers began from the already well-tested proposition that smokers who have surgery are more likely to quit smoking. In fact, they quit at twice the rate of smokers who haven’t had surgery. Not hard to understand, intimations of mortality ResearchBlogging.organd all that. They pass through a teachable moment, the scientists write in Anesthesiology, defined as “an event that prompts behavioral change.” As for smokers with kids, doctors have always had recourse to two tactics for creating teachable moments for cigarette cessation. First, they could point to increased illness and asthma in the innocent children of smokers. And when that didn’t work, they could throw in the cold fact that children exposed to secondhand smoke have a higher risk of respiratory complications during and after surgical anesthesia. And in a further queasy irony, “the increased frequency of conditions such as middle ear diseases caused by secondhand smoke may also make it more likely that children will require surgery.”

For documentation, the investigators turned to the massive National Health Interview Survey (NHIS), a questionnaire served up annually to 35,000 households by personal interview. About 12% of children in the NHIS survey in 2005 were exposed to secondhand smoke. Of the thousands of children undergoing surgery, there was an increased likelihood that a parent of one of them would inaugurate a no-smoking attempt. But these quitters were no more likely to succeed in their attempt than any other quitters.

However, “parents having surgery within the previous 12 months was associated with more quit attempts, more successful attempts, and a greater intent to quit among those still smoking.” What happened to the indestructable bond between parent and child? It appears that concerns about one’s own health trump concerns about the health of offspring when it comes to quitting cigarettes. “We can only speculate about why surgery was a significant factor associated with sustained abstinence when experienced by the smoker but not the smoker’s child.

There are plenty of limitations to these kinds of self-reported surveys, but it is hard not to speculate, along with the researchers. One obvious implication: the chances of a smoker quitting are at their maximum when parent and child both have surgeries.

“Our current findings suggest that having a child undergo surgery can serve as a teachable moment for quit attempts,” said Dr. Warner. “The scheduling of children for surgery may present us with an opportunity to provide tobacco interventions to parents, who are apparently more motivated to at least try to quit – but who need assistance to succeed.”

Shi, Y., & Warner, D. (2011). Pediatric Surgery and Parental Smoking Behavior Anesthesiology, 115 (1), 12-17 DOI: 10.1097/ALN.0b013e3182207bde

Photo Credit: http://special-needs.families.com/

Friday, June 3, 2011

For Smokers, Nowhere to Run and Nowhere to Hide


(With love and apologies to Martha and the Vandellas.)

That wonderful song goes on to declare:

'Cause I know
You're no good for me
But you’ve become
A part of me.

The song is not about cigarette addiction, but it could be. Full Disclosure: I smoked cigarettes myself for almost 25 years. And then, after several failed attempts, I quit. I out myself on this subject because a paper from the May 25 issue of the New England Journal of Medicine (NEJM) decries This post was chosen as an Editor's Selection for ResearchBlogging.orgwhat the authors call the “denormalization” of smoking—and I find myself agreeing with them, smokeless though I may be. I recently visited New York, coincidentally on the day that smoking outdoors in New York City became illegal. Okay, that’s not quite fair to say—it became illegal to smoke in Central Park, or at Brighton Beach, or along the newly pedestrian mallways of Times Square. There is no smoking along the High Line. There is no smoking at any park, beach, or pedestrian mall. As both the tobacco industry and anti-smoking activists well know, this was an iconic victory that has the potential to change smoking laws in virtually every other American city.

It’s a fascinating progression, starting in the 70s when the Civil Aeronautics Board decreed non-smoking sections on domestic airline flights, to the recent New York City Council Decision to ban smoking en plein air, so to speak. Thomas Farley, New York City Health Commissioner, summed it up as follows in a public hearing: “I think in the future, we will look back on this time and say ‘How could we have ever tolerated smoking in a park?’”

I’m not so sure on that, myself. James Colgrove, Ronald Bayer, and Kathleen Bachynski of the Mailman School of Public Health at Columbia University wrote the paper, entitled “Nowhere Left to Hide? The Banishment of Smoking from Public Spaces,” in the NEJM. The authors note that more than 500 towns and cities in 43 different states have already enacted laws banning smoking “in outdoor recreation areas.” At first, as the authors summarize the history, it all seems like a sensible compromise, built on common courtesy. First airplanes and buses, then restaurants and bars, began setting aside seats for non-smokers. By the early 90s, the first data on secondhand smoke was rolling in. Schools, convention centers, and finally even private workplaces either banned smoking or created smoke-free areas. But even then, the primary motivator, according to the researchers, was that secondhand smoke was “unpleasant and annoying,” not deadly. Smokers weren’t being asked to refrain from public smoking for the good of their own health, but as a courtesy to others.

The solid scientific evidence kept accumulating, however—even though tobacco cigarettes were, and still are, completely legal products for adult Americans to purchase and consume if they so choose. Now the arguments shifted to the innocent bystanders, those within the six-foot ring, the immediate smoke zone surrounding a smoker, and the elevated risk of lung cancer, heart disease, and asthma that smokers were subjecting them to. In 1993, the Environmental Protection Agency (EPA) classified secondhand smoke as a Class A carcinogen, and more school, stadiums and offices proscribed smoking.

So far so good, really, from a public health standpoint. But now comes the bend in the road. Suddenly, parks and beaches were being added to the no-smoking roster. “As the zones of prohibition are extended from indoor to outdoor spaces, however, the evidence of physical harm to bystanders grows more tenuous.” In 2008, the authors report, “The editor of the journal Tobacco Control dismissed as ‘flimsy’ the evidence that secondhand smoke poses a threat to the health of nonsmokers in most outdoor settings.”

This confusion was much in evidence at public hearings last fall on the proposed outdoor smoking bans. While Health commissioner Farley argued that 57% of New Yorkers showed nicotine by-products in their blood, he also argued that exposing young children to adults in the carnal act of smoking was detrimental to the public health and welfare. “Families,” he said, “should be able to bring their children to parks and beaches knowing that they won’t see others smoking.” This is really quite an astonishing assertion, given the range of bad habits youngsters are exposed to as they go about a normal day in the adult world. The authors are particularly concerned about this push to stigmatize smokers. “Given the addictive nature of nicotine and the difficultly of quitting smoking, strategies of denormalization raise both pragmatic and ethical concerns.” Furthermore:

The decline in U.S. smoking rates since the 1960s has coincided with the development of a sharp gradient along the lines of socioeconomic status. Whereas about one fifth of all Americans are smokers, about one third of those with incomes below the federal poverty level smoke. These data are especially pertinent to the question of bans in parks. Since smokers are more likely to be poor and therefore dependent on free public spaces for enjoyment and recreation, refusing to allow them to smoke in those places poses potential problems of fairness.

The anti-tobacco movement, frustrated by the slow pace of gains over several years of active efforts, with rates of smoking remaining essentially unchanged, has to face the fact that an outright ban on cigarettes is a ticket to black market, crime syndicate hell. But a de facto ban is something altogether different, and “steadily winnowing the spaces in which smoking is legally allowed may be leading to a kind of de facto prohibition.” More and more employers prohibit smoking in doorways, within ten feet of doorways, anywhere on university campuses, and so on. No one has voted to make cigarette smoking illegal. But the public space in which this legal activity can be pursued is disappearing. And here is where the tough questions start: “In the absence of direct health risks to others, bans on smoking in parks and beaches raise questions about the acceptable limits for government to impose on conduct,” the authors conclude. Not to mention issues of personal autonomy, individual choice, and the stigma attached to addictive behavior. Perhaps the ACLU will soon take an interest in the civil rights of outdoor smokers, where the only health being hazarded is the smokers’ own.

Colgrove J, Bayer R, & Bachynski KE (2011). Nowhere Left to Hide? The Banishment of Smoking from Public Spaces. The New England journal of medicine PMID: 21612464

Photo Credit: www.thinkstock.com

Thursday, March 18, 2010

Germs in Tobacco


Bacteria found in major cigarette brands.

It’s not enough that smoking causes all manner of cardiopulmonary complications, or that more than 3,000 chemicals and heavy metals have been identified as additives. Now comes evidence that tobacco particles extracted from cigarettes contain markers for hundreds of known bacteria. Lung infections in some smokers may be caused by germs on shredded tobacco, rather than the act of smoking itself.

According to a report by Janet Raloff in Science News, Amy Sapkota and a team of researchers at the University of Maryland screened tobacco flakes from cigarettes for bacterial DNA using known markers. ResearchBlogging.orgIn an online paper for Environmental Health Perspectives, the scientists explored the bacterial metagenomics of cigarettes using standard cloning and sequencing processes. The team provided evidence for the presence of Campylobacter (a cause of food poisoning), E. coli, several Staphylococcus varieties, as well as a number of bacteria, such as Clostridium, which is directly associated with pneumonia and other infections. Fifteen different classes of bacteria in all, with no significant variation from one cigarette brand to another. 

The time has come, Sapkota and coworkers conclude, “ to further our understanding of the bacterial diversity of cigarettes,” given the more than 1 billion smokers worldwide.  Smoking is now recognized as a risk factor for a basketful of respiratory illnesses, including influenza, asthma, bacterial pneumonia, and interstitial lung disease. In light of this, the authors have advanced their study as solid evidence that “cigarettes themselves could be the direct source of exposure to a wide array of potentially pathogenic microbes among smokers and other people exposed to secondhand smoke.”

In 2008, researcher John Pauly and coworkers at the Roswell Park Cancer Institute in Buffalo, New York, helped provide early evidence by conducting a tobacco flake assay and publishing the results in the journal Tobacco Control. The scientists opened a package of cigarettes “within the sterile environment of a laminar flow hood. A single flake of tobacco was collected randomly and aseptically from the middle of the cigarette column and placed onto the surface of a blood agar plate. The test cigarettes included eight different popular brands, and these were from three different tobacco companies.”

And the results? “After 24 hours of incubation at 37 degrees C, the plates showed bacterial growth for tobacco from all brands of cigarettes. Further, more than 90% of the individual tobacco flakes of a given brand grew bacteria.” Pauly believes that “the results of these studies predict that diverse microbes and microbial toxins are carried by tobacco microparticulates that are released from the cigarette during smoking, and carried into mainstream smoke that is sucked deep into the lung.”


In a recent study published in Immunological Research , Pauly and others expanded on their findings, writing that “Cured tobacco in diverse types of cigarettes is known to harbor a plethora of bacteria (Gram-positive and Gram-negative), fungi (mold, yeast), spores, and is rich in endotoxin (lipopolysaccharide).” This time out, the researchers conclude that “lung inflammation of long-term smokers may be attributed in part to tobacco-associated bacterial and fungal components that have been identified in tobacco and tobacco smoke.”

Cigarette manufacturers already use antibacterial washes during the curing process in order to reduce infection by fungi and bacteria.

If the findings are sound, they could place the argument over secondhand smoke in a vastly different light—cigarettes smoke may be taking the rap for respiratory infections cause by extant bacteria. With smoking rates in the U.S. holding at a steady 21 percent of the population, the issue is not trivial.


Sapkota, A., Berger, S., & Vogel, T. (2009). Human Pathogens Abundant in the Bacterial Metagenome of Cigarettes Environmental Health Perspectives, 118 (3), 351-356 DOI: 10.1289/ehp.0901201

Pauly, J., Smith, L., Rickert, M., Hutson, A., & Paszkiewicz, G. (2009). Review: Is lung inflammation associated with microbes and microbial toxins in cigarette tobacco smoke? Immunologic Research, 46 (1-3), 127-136 DOI: 10.1007/s12026-009-8117-6

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