I don't think there has ever been any link to marijuana use and lung cancer or any kind of cancer. For that matter, the chinese have yet to find a link between tobacco use and lung cancer which has, in part, been attributed to the differences in the way tobacco is treated and processed in Asia, as opposed to the US.
bonsaiguy Reviewed by bonsaiguy on . News: Heavy marijuana use linked to bladder cancer Heavy marijuana use linked to bladder cancer Reuters | February 02 2006 Pot smokers could be putting themselves at risk for developing bladder cancer, according to the results of a study of middle-aged men who were seen at two Veterans Administration facilities. Marijuana smoking "might be an even more potent stimulant" of malignancy than cigarette smoking, Dr. Martha K. Terris of the Medical College of Georgia in Augusta and her colleagues write in the medical journal Urology. Rating: 5