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Aging baby boomers beware: toking may increase risk of heart attack by up to five times
About Mental Health | 10/2/2005

BOSTON--Researchers at Beth Israel Deaconess Medical Center and their colleagues have found that people who smoke marijuana may increase their risk of a heart attack. In a study of nearly 4,000 people who had suffered a heart attack, the researchers observed that a person's chance of having a heart attack, particularly those who are already at risk for heart disease, increased nearly five times during the first hour after smoking marijuana.

These findings, published in the June 12 issue of Circulation, may become more relevant as baby boomers, who are more likely that previous generations to smoke marijuana, enter the age at which heart disease is more common.

"People's risk for coronary artery disease increases as they enter their 40s and 50s, so the risks associated with smoking marijuana, which might have been a trivial issue when people were younger, may now pose a significant health concern," says lead author Murray Mittleman, M.D., Dr.P.H., and director of cardiovascular epidemiology at Beth Israel Deaconess.

Marijuana is considered the most widely used illicit drug in the U.S. More than an estimated 72 million Americans have smoked marijuana or hashish at least once in their lifetime. New evidence suggests that there is a shift in the age distribution of marijuana users, with regular use on the rise among people in their 30s, 40s, and 50s. A recent Institute of Medicine report notes that even if marijuana use poses no medical risk for healthy young adults, any effect of marijuana use on cardiovascular health among middle aged and older adults could have a significant impact on public health.

For this new study, Mittleman and his colleagues interviewed 3,882 heart attack patients, as part of the multicenter Determinants of Myocardial Infarction Onset Study. Study participants were interviewed an average of four days after a heart attack. They included men and women from age 20 to 92. More than half of the study subjects were men. On average, marijuana users were about 44 years old. Twenty-three percent of the participants who smoked marijuana were between 50 and 69 years old.

Of the 124 patients who reported using marijuana in the past year, only nine were found to have smoked marijuana in the hour before their heart attack. Even though marijuana use was rare among study participants, the researchers found that in the hour after smoking marijuana the relative risk of heart attack increased 4.8 times. To evaluate relative risk, comparisons were made between the frequency of marijuana use in the hours preceding heart attack symptoms and the frequency of marijuana use over the past year, as recalled by study participants.

When compared to non-users, marijuana smokers were more likely to be men. They also were more likely to be obese and to smoke cigarettes. A history of angina and high blood pressure was less common among individuals who smoked marijuana.

While smoking marijuana was found to be less risky as an immediate trigger of heart attack than using cocaine, it is roughly as dangerous as exercise for a fit person and more dangerous than sex for a sedentary person.

Studies have shown that marijuana use increases heart rate, but it is not entirely clear how marijuana may trigger a heart attack. One school of thought is that the drug may trigger a heart attack by causing existing coronary plaques to rupture and clot, restricting blood flow to the heart. Mittleman, who also is an assistant professor at Harvard Medical School and Harvard School of Public Health, says more studies are needed to understand the various pathways that are leading from the external stressors to the occurrence of heart attack. Once this information is in hand, he adds, investigators might be able to develop novel strategies to prevent heart attacks.

"Our study provides new information for the debate on the medical uses of marijuana and highlights the importance of considering the potential benefits and risks of taking any substance for medical use," concludes Mittleman.

The study's coauthors are Rebecca Lewis, Beth Israel Deaconess, Malcolm Maclure, Sc.D., and Jane Sherwood, R.N., both from Harvard School of Public Health, and James Muller, M.D., Massachusetts General Hospital.

Study funding came from the National Heart, Lung, and Blood Institute and the American Heart Association.

Beth Israel Deaconess Medical Center is a major patient care, research and teaching affiliate of Harvard Medical School and a founding member of CareGroup HealTHCare System. Beth Israel Deaconess is the third largest recipient of National Institutes of Health research funding among independent U.S. teaching hospitals.

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Dennis

These sensationalists studys always say "may" "might" "possibly" etc... You never here "will" "no doubt" etc... Anything is possible, why make something up if you're not sure. There's an agenda, no doubt.

By the way, stress related to the medical professionals "will" cause heart attacks. The average age of Doctors when they die is 55. I'll take my chances with weed.

Buzzby

So they're basing this conclusion that smoking increases the risk of heart attacks on nine people out of a population of 3,882 who already had heart attacks. I question if that is statistically significant. I also question how many people in the heart attack age-range would admit to being a marijuana smoker. Boston is the marijuana-smoking capital of the United States with 12% of the population reporting use.


I don't suppose being a big fat cigarette smoker could have anything to do with the risk of having a heart attack.


I'm trying really hard to understand this. Are they suggesting that fit people give up exercise to avoid a heart attack? If not, why should they give up smoking pot? Given a choice between ways to reduce the risk, I'd lean towards giving up exercise...

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vladimir

not saying that this is any conclusive evidence, but my heart does tend to hurt more after smoking pot and actually also after smoking cigarettes. maybe it's just smoking in general, but it is probably just me.

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PotShot

Yeah, I had to scan this over a few times as well.

Basically, if you are overweight and smoke cigarettes, you should'nt smoke pot then have sex?

The title of this article was:Aging baby boomers beware: toking may increase risk of heart attack by up to five times.

So smoking may increase the chances, or may not. Other factors though are certainly more important, like how fat you are, or if you do other dumb things like smoking cigarrettes.

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Mamabudz

REEFER MADNESS!!!!

...of course peopel over 40 should not exercise or have sex...they may have a heart attack...

Now about those 9 folks...

CheebaMonkey

This study is old, published in 2001.

Junk Science Makes Headlines

A study linking marijuana smoking and heart attacks was recently published in the American Heart Association’s journal Circulation. The study, conducted by Dr. Murray Mittleman of the Beth Israel Deaconess Medical Center in Boston, is being seized upon by opponents of marijuana law reform as justification for marijuana prohibition. However, the results of Dr. Mittleman’s study are hardly newsworthy.

An analysis of the research methods used reveals glaring flaws. The sample size is statistically insignificant, no causal relationship has been established, and the study itself has never been replicated – yet it’s making headlines around the world for the second time. The study first made headlines last year following a conference presentation, despite not having ever been published in a reputable peer reviewed medical journal.

Out of 3,882 patients who had heart attacks, 124 were current marijuana smokers and 9 had smoked within an hour of their heart attack. Based on this minuscule, self-selected sample, Dr. Mittleman concludes that the risk of a heart attack is 4.8 times higher after smoking marijuana. The sample size alone renders the results meaningless. Assuming that Dr. Mittleman's conclusions are correct, the fact that heart attack risk for an otherwise healthy 50-year-old man is about 10 in 1 million highlights the sensationalism of the widespread publicity the study is receiving.

Such junk science is often well publicized. The U.S. government has spent millions of tax dollars trying to find harm in a relatively harmless plant, while research that might demonstrate the medical efficacy of marijuana is consistently blocked. The payoff for this highly politicized research has been tremendous. The conclusions are typically reported by the media without any critical analysis of the methodology used. Regardless of whether or not the Mittleman study is ever replicated, the results will no doubt be repeated by drug warriors for decades.

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Buzzby

I thought those numbers looked kind of hinky! Thanks for the post, Cheeba.

What kind of name is "Beth Israel Deaconess"? Is the hospital run by Jews for Jesus™?

Mamabudz

HUmph...I resemble that remark young man!

from ou friends at Wikipedia:

Beth Israel Deaconess Medical Center, located in Boston, Massachusetts, is one of the three major teaching hospitals affiliated with Harvard Medical School. It is the flagship hospital of the Caregroup Healthcare System of Massachusetts, and was formed out of the 1996 merger of Beth Israel Hospital (founded in 1916) and New England Deaconess Hospital (founded in 1896).

Lothar121

Yeah this "study" should not be mentioned in the media with any sort of credibility. I threw it in the trash a long time ago.

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