"Marijuana contains more carcinogenic hydrocarbons than tobacco smoke and because marijuana smokers usually inhale deeper and hold the smoke in their lungs longer than tobacco smokers, their lungs are exposed to those carcinogenic properties longer."
"One study found that marijuana smokers were three times more likely to develop cancer of the head or neck than non-smokers. Many researchers believe than smoking marijuana is overall more harmful to the lungs than smoking tobacco."
This reasoning is specious, because marijuana smokers do not smoke marijuana cigarettes as often, or in the same way, as cigarette smokers smoke cigarettes. A typical cigarette smoker smokes many cigarettes per day, while a typical marijuana smoker may smoke a total of one or two marijuana cigarettes per week.
Thank you very much for those site, I was looking for an actual reference to possible psychotic effects. The increased cancer risk is truly interesting. The second article you posted addresses both. Again, thanks. I am going to have to learn to google better. Talking facts about “just pot” usually draws snickers.