To this day not one single person who used(s) cannabis only has ever developed lung cancer or any other kind of cancer.
Unlike tobacco smoke, which cause cancer because the tars in tobacco smoke contain radioactivity, cannabis smoke doesnt contain radiation in its tars, therefore we see nor hear of any reported cases of lung cancer in the cannabis using population. Tobacco smoke causes permanent long term damage to the lungs. Cannabis smoke doesnt. This research is presented to us from Dr. Tashkins, America's number one lung expert when it comes to Marijuana smoke, U.C.L.A.
The statistics that come from the U.S. Surgeon Generals Report confirm his findings. Cannabis is known to be anti-tumor.
A book(s) i would suggest is Ernest Ables "Marijuana, the first 12,000 years"
Encyclopedia of the World Britannica: Great accurate information can be found in both.

dai*ma :thumbsup: