Study: Habitual Marijuana Smoking Not Associated With Increased Risk Of Lung Cancer

  • by Paul Armentano, NORML Deputy Director June 23, 2014

    Subjects who regularly inhale cannabis smoke possess no greater risk of contracting lung cancer than do those who consume it occasionally or not at all, according to data published online ahead of print in the International Journal of Cancer.

    An international team of investigators from Canada, New Zealand, the United Kingdom, and the United States analyzed data from six case-control studies involving over 5,000 subjects (2,159 cases and 2,985 controls) from around the world.

    Authors concluded, “Results from our pooled analyses provide little evidence for an increased risk of lung cancer among habitual or long-term cannabis smokers.”

    Investigators had previously presented their data at the 2013 annual meeting of the American Academy for Cancer Research.

    Their findings are similar to those of a 2013 review published in the journal Annals of the American Thoracic Society, which concluded: “[H]abitual use of marijuana alone does not appear to lead to significant abnormalities in lung function. … Overall, the risks of pulmonary complications of regular use of marijuana appear to be relatively small and far lower than those of tobacco smoking.”

    An accompanying commentary in the same journal affirmed, “[C]annabis smoking does not seem to increase risk of chronic obstructive pulmonary disease (COPD) or airway cancers. In fact, there is even a suggestion that at low doses cannabis may be protective for both conditions.”

    Preclinical studies have documented that cannabinoids possess potent anti-cancer properties, including the inhibition of lung cancer cell growth. To date, however, scientists have yet to conduct controlled clinical trials replicating these results in human subjects.

    The abstract of the study, “Cannabis smoking and lung cancer risk: Pooled analysis in the International Lung Cancer Consortium,” appears online here.

    28 Responses to “Study: Habitual Marijuana Smoking Not Associated With Increased Risk Of Lung Cancer”

    1. Dave Evans says:

      “Why on God’s green earth, don’t they try to regulate on a legal level? Prohibition of cannabis makes no sense at all. Pharmaceutical companies? They will eventually lose some of their money, as public opinion changes, and the majority of Americans demand fair laws. They might as well give in, and then move on. They’ll find other ways to make money.”

      Yeah, but if you count hurting people as part of your profit, there is muck less profit for you in legal regulations that make sense. Where is the opportunity to harm an innocent person under that law??? How can you turn around and use marijuana as an excuse to put people in jail if it is legal and well regulated? The primary goal of marijuana prohibition is to lock up and otherwise harass innocent people and steal their money.

      Unlawful arrest and detention.

      Stealing of money from the general fund and directly from arrested victims; often expressly used to maintain the fiction marijuana is a “bad drug”.

      Everyone is the government is taught to have a bias against marijuana. Nearly all government jobs piss test. These folks already have a sheeple mindset. The judges look at the situation like, “well if I don’t have this right, why would I defend and thus extend it to someone else?”

    2. scott Fitzgerald says:

      Your over cooking them for one. Turn the heat down, learn to grow.
      Brownies will harden very quick.Make cupcakes.

    3. Anne Green says:

      I would be interested in finding out how to make topical and or tinctures + extracts…
      my brownies came out like “stones; I ate them anyway; fed some to the birds; Brownies are expensive to make; Weed is way to0 expensive!!

    4. A Queen of Green says:

      I was reading “smoking Mullein or using Tea” actually “clears the lungs”! Indian Tobacco !
      (I would use the Tea; buy @ store or grow mine

      Mullein can be used as a short acting candle:
      other names: Aaron’s Rod and Indian Flannel; because the leaves are soft like Flannel…
      Mullein is a tall weed seen in fields/meadows.

    5. Queen of Green says:

      Most people do not know almost any Herb can be “smoked” or “brewed for Tea”; take the common Mullein Plant: flowers are used for Tea; the roots are boiled for syrup; the leaves are smoked by American Indians; the soft velvety leaves line the Indian Moccasins.

    6. Tavon says:

      If you stand for civil rights, please sign my petition! ~ http://chn.ge/1eCsHId

    7. Dave Evans says:

      Anne, they have known for almost 50 years that in order to “make a safer cigerette” all you have to do is mix in some marijuana extract.

      However, they would rather lie to our faces and say completely dumb things like, there is no way to make a “safer cigarette”, which is just the excuse they use in their own heads for lacing poisons into the cigarettes to increase their addiction potential and make them kill you faster.

    8. ANNE Queen of Green says:

      If I were a tobacco co. researcher: I would conduct tests using different Herbs and patent the world’s first Herbal Cigarette w/Hemp Leaves(CBD or male plants) w Mint buds!
      Give the people what is beneficial for Health!

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