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French Study Gets It Wrong on Heart Disease and Cannabis Use

An x-ray shows a healthy heart within a rib cage, even though the owner has smoked marijuana.


French Study Gets It Wrong on Heart Disease and Cannabis Use

A recent study in France was the genesis of the latest in overreaching conclusions about the effects of marijuana smoking. Supported by the French InterMinisterial Mission for the Fight Against Drugs and Addiction and the French drug agency ANSM, the study claimed that marijuana use may increase the risk of heart and circulatory conditions in young adults, with potentially fatal consequences.

The researchers looked at the 1979 reports made to the French Addictovigilance Network from 2006 to 2010. Health care professionals who encounter serious cases of abuse and dependence related to psychoactive drug use are required to anonymously report.

The researchers found 35 reports of cardiovascular problems during this period, an increase from 1.1 percent to 3.6 percent of all cases reported. Nine of the individuals died. The average age of the patients was 34 and 85 percent were male.

Looking a little deeper, this small number becomes even smaller when other factors are taken into account. For example, nine of the individuals had pre-existing cardiovascular disease. That leaves 24. Of those 24, another 15 were tobacco smokers—a known risk factor for cardiovascular disease. Another was using cocaine and one more was using ecstasy. That leaves seven individuals — hardly an adequate number to conclude that a link exists between cannabis use and cardiovascular events.

Other factors not adequately considered by using these data were obesity and family history of cardiovascular disease.

Because other studies have shown that there may be a link between cardiovascular events and cannabis, individuals who have pre-existing heart or circulatory problems, patients who have these conditions would be wise to talk to their doctors about their use of cannabis.

What do you think of the French study? Tell us in the comments below!



  1. Tom

    May 22, 2014 at 8:16 pm

    They blame it on slow blood flow in long term user?

  2. Ron McPike

    May 9, 2014 at 8:34 pm

    Looks like the French Propaganda Machine is as narrow minded &stupid as the U.S.DEA,IDA&Partnership for Drug Free America [email protected]

  3. Francois Meg

    May 7, 2014 at 10:09 pm

    All this is that the anti cannabis propaganda to the French, here in France, the Academy of Medicine is clearly prohibitionist, our physicians Academy, cannabis is a drug, there is not the differences between hard and soft drugs, cannabis is lethal and very dangerous.
    I am really ashamed of things French, believe me!

  4. Mike Parent

    May 7, 2014 at 3:16 pm

    “Narcotics police are an enormous, corrupt international bureaucracy … and now fund a coterie of researchers who provide them with ‘scientific support’ … fanatics who distort the legitimate research of others. … The anti-marijuana campaign is a cancerous tissue of lies, undermining law enforcement, aggravating the drug problem, depriving the sick of needed help, and suckering well-intentioned conservatives and countless frightened parents.”
    — William F. Buckley,
    Commentary in The National Review, April 29, 1983, p. 495 n

  5. Andrew Fry

    May 7, 2014 at 2:28 pm

    When these numbers are compared against the number of actual cannabis users in France, they become so small statistically that that they do not even suggest correlation, much less the sensationalized causation reported by the media. There are more than one million two hundred thousand cannabis users in France, meaning that after adjusting for the obvious risk factors these seven cases represent 0.00058% of the cannabis using population, or one in every 172k users. Statistics are actually higher for non users, suggesting that, if anything, these numbers should be interpreted as a blatantly obvious reason to use cannabis, rather than a poorly crafted excuse not to.

  6. sartkeda m. al-fatiha

    May 7, 2014 at 1:22 pm

    Marijuana,hemp, cannabis r harmless,if they just use it in its natural form

  7. Rick Jones

    May 7, 2014 at 7:36 am

    That French,’ Study’m Didnt Seem to B Much of a Study when i First Heard about it,,& Now i See how Truly IGNORANT they Are,
    On another note,i Wanted to comment on the Bowl o Nuggs,,it Should B called ,’ StrawBerry HEAVEN ”,

  8. fernando berot

    May 6, 2014 at 3:45 pm

    very stupid and nothing of science there, just some assholes think they have some kind of backup to justify what they think about pot.

    • Mason

      May 7, 2014 at 6:35 am

      If it was very stupid and nothing of science, you would have a scientific response to prove another scientific response wrong. Not that I don’t support marijuana, but law writers do take statistics based on information they find online to some degree.. If you want to help, do that. Don’t just antagonize or you’re proving their skepticism right.

  9. Paul Pot

    May 6, 2014 at 3:40 pm

    But don’t we keep hearing zero deaths from cannabis.
    Look at the stats. There are lots of smokers and just by coincidence some people should have heart attacks while stoned and this alone would be enough to get some people jumping up and down. It seems very few people have heart attacks while stoned. Cannabis protects against heart attack.

    • Tom

      May 26, 2014 at 11:10 am

      Ive seen doctors talk about blood clock and strokes but I don’t believe it, It has more carcinogens then tobacco but doesn’t cause cancer, Cannabis is more complicated then doctors would like to imagine.

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