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1. Marijuana use is associated with higher risk for testicular cancer. In a 2011 study published in the journal Cancer, researchers from the National Cancer Institute found that men with testicular cancer were 2.2 times more likely to be regular marijuana smokers (daily or more often) then men without this rare cancer. A 2009 study from the Fred Hutchinson Cancer Center in Seattle found the same thing. Researchers aren’t sure exactly why, but note that “The exact mechanism of how heavy marijuana use might increase the risk of TGCT (testicular germ cell tumors) is unknown, however chronic marijuana exposure has multiple adverse effects on the endocrine and reproductive systems such as gynecomastia, impotence, reduced sperm counts, and suppressed testosterone.”
2. Marijuana more than doubles lung cancer risk. French researchers concluded in a 2008 study that marijuana users were 2.4 times more likely to develop lung cancer than non-users. And cancer investigators in New Zealand found that the heaviest marijuana users in their 2008 study had a five-fold higher risk for lung cancer compared to non-users. In general, they found that smoking one joint daily for a year raised risk slightly more than a pack-a-day smoking habit did.
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