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Marijuana Smoking Not Associated With Increased Risk Of Lung Cancer

marijuana lung cancer

(via karmajello.com)

by Paul Armentano, NORML Deputy Director

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.

Source: NORML - make a donation


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Johnny Green


  1. Great to see a study for Lung Cancer and Marijuana concerns. Its clear that all the crap in cigarettes makes them more dangerous. IMO there is no comparison between a natural marijuana product and tabacco which is genetically modified and sprayed with poisons known to cause cancer.

  2. There was an article in the New York Times today interesting because the NYT should know better, but jumped on the prohibition bandwagon. The article argued that the medicinal value of MJ is exaggerated because proper studies are lacking. Of course, the author/s seem to have no problem condemning the sacred plant without any studies of their own, making the article hypocritical at best. Also, it failed to mention that many studies have been made, but were brushed aside because the politicos didn’t want to admit the truth of the reports–the Shafer Report being the best example of course. Finally, the fact was ignored that many studies have been axed because MJ is illegal and is therefore inaccessible. When will all the lies stop?

  3. This is why the government won’t allow any research on marijuana. They know that it will turn out to be the “miracle medicine” of the modern age and expose the utter hypocrisy of their marijuana prohibition policies! Not to mention taking a serious bite out of the medical and pharmaceutical industries’ profits!

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