"The largest study of smoking ever conducted with the financial backing of the federal National Intstitute on Drug Abuse has confirmed that tobacco use causes cancer and, to the researchers' surprise, marijuana smoking did not. 'We hypothesised that there would be a positive assosiation between marijuana use and lung cancer, and that the association would be more positive with heavier use,' Priciple investigator Dr. Donald Tashkin said in a may presentation at the American Thoracic Society. He suggested that, in addition to perported carcinogens, cannabis smoke contains THC that may kill aging cells and keep them from becoming cancerous. 'What we found instead was no association at all, and even a suggestion of some protective effect.'"
-Heads Magazine

Doesn't cause lung cancer? Can it get any better?