Chronic cannabis use: conference summary.
D002188:Cannabis; D003364:Costa Rica; D004361:Drug Tolerance; D006115:Greece; D006801:Humans; D007563:Jamaica; D001523:Mental Disorders / Q000139:chemically induced / Q000209:etiology; D009042:Motivation / Q000187:drug effects; D011581:Psychological Tests; D011605:Psychoses, Substance-Induced / Q000209:etiology; D019966:Substance-Related Disorders / Q000150:complications; D013997:Time Factors; D014481:United States