Heavy marijuana users not in treatment: the continuing search for the "pure" marijuana user.
D000293:Adolescent; D000328:Adult; D000367:Age Factors; D005260:Female; D006801:Humans; D008297:Male; D002189:Marijuana Abuse / Q000453:epidemiology* / Q000628:therapy; D008875:Middle Aged; D019966:Substance-Related Disorders / Q000453:epidemiology; D014481:United States