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See also: 
Cannabis in Japan (main index) 
Hemp as a "drug", 
Alcohol, 
Nicotine (Tobacco) 
Drug risks: How dangerous are the most common drugs? 
Index of WHO report.
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 WHO Project on Health Implications of Cannabis Use:  A Comparative Appraisal of the Health and Psychological
Consequences of Alcohol, Cannabis, Nicotine and Opiate Use  Table 1:  Summary of ratings of overall effects of drug use by current users (Percent)
 
 
 
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