Thread: New marijuana study on long term lung function
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Jan13-12, 10:33 AM   #23
 
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Quote by SW VandeCarr View Post
I can't speak to the survey you're citing, but in general surveys of this type tend to underestimate actual usage, at least in countries where marijuana is illegal.

http://alcoholism.about.com/od/news/a/blndri060306.htm
http://heinonline.org/HOL/LandingPag...v=46&id=&page=
The statistics that I cited is for condoned cannabis use in Amsterdam, statistics for San Francisco are very similar (see graph). The percentages match my personal observations, although I agree that self-reported observations are not as reliable as actual measurements.