Don't forget that smokeless tobacco causes cancer as well, so there's something other than combustion going on. I've also seen studies that show marijuana use b

Don't forget that smokeless tobacco causes cancer as well, so there's something other than combustion going on. I've also seen studies that show marijuana use by itself (without also smoking tobacco) doesn't significantly increase lung cancer rates. http://www.m.webmd.com/a-to-z-guides/news/20060523/pot-smoking-not-linked-to-lung-cancer http://www.m.webmd.com/a-to-z-guides/news/20060523/pot-smoki... http://www.enewspf.com/latest-news/health-and-fitness/53910-study-habitual-marijuana-smoking-not-associated-with-increased-risk-of-lung-cancer.html http://www.enewspf.com/latest-news/health-and-fitness/53910-...