"Pot Hurts Lungs More Than Tobacco" Debunked

Discussion in 'Marijuana News' started by Storm Crow, Dec 6, 2022.

  1. A while back, a study came out that had the media reporters screaming that "Cannabis smoke is harder on the lungs than tobacco smoke"! Turns out it was just more "junk science"! For the study, they divided their subjects into non-smokers, tobacco only users, and Marijuana users. The sample size was so small, AND of their 56 "marijuana smokers", 50 of them also used tobacco!

    To do this study right, they really should have had FOUR groups- non-smokers, tobacco only, cannabis + tobacco and cannabis only. However, with all the other "flaws", so this one belongs in the "junk science trashcan" along with the "Dunedin" IQ study and many others! :coolalt:

    Does cannabis smoke really cause more lung damage than tobacco smoke? Flaws in a viral study
    Does cannabis smoke cause more lung damage than tobacco smoke? A researcher reveals the truth

    “The study should be retracted, honestly.”

    Katie MacBride
    12 hours ago
    Earlier this month, researchers published a study in the journal Radiology that was prime fodder for misleading headlines. The study sought to investigate the effect of marijuana smoke on the lungs. The researchers say they found more lung damage in the marijuana smokers’ group than in the tobacco smokers’ group. That led to a rash of headlines like this one from the Chicago Sun-Times: Smoking marijuana might be more harmful to your lungs than tobacco, study suggests. But here’s the catch: That’s not actually what the study found.

    The researchers (radiologists at the University of Ottawa) note that with the legalization of recreational cannabis use in Canada and the United States, there’s a need to better understand the effects of cannabis smoke on the lungs. For the study, they analyzed the CT chest scans of three groups: marijuana smokers, tobacco-only smokers, and non-smokers, with the latter group serving as a control.

    Of the 56 participants in the marijuana smokers’ group, 50 also had a history of smoking tobacco. Among the marijuana and tobacco smokers, the mean number of “pack years” among the marijuana smokers was 25. (“Pack years” are a way of calculating the amount smoked and the number of years a person smoked. For example, if you smoked two packs a day for one year, you would have smoked for two pack years; if you smoked half a pack a day for eight years, you would have smoked for four pack years.) The mean number of pack years among the tobacco-only group was 40.

    The study authors concluded that the marijuana and tobacco group had more lung damage than to the lungs than tobacco alone did. That isn’t a terribly surprising conclusion. Inhaling smoke, be it wildfire, marijuana, or cigarette smoke, will damage your lungs. Certainly, some kinds of smoke can be more damaging than others, so it may well be that a history of inhaling two types of smoke might damage a person’s lungs more than inhaling just one kind.

    Now way back in 2012, WebMD did an article, “Smoking Pot, Cigarettes Ups COPD Risk” (a very poorly titled article), and here's what they said-

    · The incidence of COPD among participants who smoked cigarettes alone was 2.7 times higher than among nonsmokers.

    · The incidence of COPD was 2.9 times higher among participants with a history of smoking both cigarettes and pot, even after controlling for other risk factors for the pulmonary disease.

    · COPD risk among people who smoked marijuana, but not tobacco, was slightly higher than among nonsmokers, but the increase was not statistically significant.

    :GettingStoned: So, we get 2.9 – 2.7 = an actual increase of .2% risk of COPD if adding cannabis to tobacco smoking!

    And by the way, smoking tobacco cuts down on the number of CB1 receptors (the ones that get you high)! So tobacco smokers may not be getting their optimal cannabis high! :eek2:

    Decreased Cannabinoid CB1 Receptors in Male Tobacco Smokers Examined With Positron Emission Tomography. (USA/ Finland) (full – 2018) Decreased Cannabinoid CB1 Receptors in Male Tobacco Smokers Examined With Positron Emission Tomography

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  2. It's so easy to create "medical studies", and yet so many believe them without verifying that the studies aren't biased/accurate...
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  3. It’s interesting that cigarette smoke decreases the CB1 receptors. Now I’ve got another discussion point to debate with my cigarette smoking crowd.
    Thanks Granny:passing-joint:
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  4. harm reduction journal article - All smoke is not created equal , Melamede
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