"The largest study of its kind has unexpectedly concluded that smoking marijuana, even regularly and heavily, does not lead to lung cancer."
"We hypothesized that there would be a positive association between marijuana use and lung cancer, and that the association would be more positive with heavier use," he said. "What we found instead was no association at all, and even a suggestion of some protective effect."
"...marijuana also contains the chemical THC, which he said may kill aging cells and keep them from becoming cancerous."
I guess the message is:
If you smoke...smoke!