title: Problems in studying the effects of chronic cannabis use on intellectual abilities.
mesh_terms: D000328:Adult; D000367:Age Factors; D002188:Cannabis; D006801:Humans; D007360:Intelligence / Q000187:drug effects*; D007563:Jamaica; D009656:North America; D010551:Personality; D011581:Psychological Tests; D012107:Research Design; D019966:Substance-Related Disorders / Q000503:physiopathology*; D013997:Time Factors