Originally Posted by
mewantkouki
I'm not convinced. The study specifically states that it sampled recreational and occasional smokers. Put together a research study involving habitual and chronic marijuana smokers to observe long term effects.
"On average, cigarette users smoked about 9 cigarettes daily, while average marijuana use was only a joint or two a few times a month — typical for U.S. marijuana users, Kertesz said."
If Marijuana were legal for purchase I can guarantee it would be abused.
Smoke 9 joints a day for 15 years and go do a spirometry test. Prolonged exposure to the burnt inhalation of anything has the potential to cause adenocarinomas. Do a little research on Polynuclear Aromatic Hydrocarbons and their relationship to cancer formation before you blindly believe everything you read on yahoo news.

Organic chemistry helps too.
i might have everyday multiple times for years.. My spirometer reading was 5.5l, which i believe is like 2l more than the average human...so, it may have a reverse affect by working the lungs with smoke. and without tar, addiction. (black stuff people rant about in lungs is isnt in budd)