The bottom line on marijuana use and risk of cancer? Though marijuana most likely pales in cancer risk when compared to cigarette smoking, it's best to practice caution. There are reasons in addition to lung cancer risk (and the fact that it is illegal in many states) to avoid marijuana. Marijuana likely increases the risk of testicular cancer, prostate cancer, cervical cancer, a type of brain tumor, and the risk of leukemia in the offspring of women who use weed during pregnancy.


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