Saying no to marijuana: why American youth report quitting or abstaining.
D000293:Adolescent; D003430:Cross-Sectional Studies; D003625:Data Collection; D005006:Ethnicity / Q000523:psychology; D005260:Female; D006801:Humans; D008297:Male; D002189:Marijuana Abuse / Q000453:epidemiology / Q000208:ethnology / Q000523:psychology*; D012737:Sex Factors; D013334:Students / Q000523:psychology*; D019966:Substance-Related Disorders / Q000453:epidemiology / Q000208:ethnology / Q000523:psychology*; D014481:United States / Q000453:epidemiology / Q000208:ethnology