title: Epidemiology of drug abuse: an overview.
abstract: Issues regarding the use of epidemiology in drug abuse research are discussed and systems for monitoring national trends and identifying risk factors are described. Data indicate a general decline in marijuana use among youth, a cohort aging effect among heroin and marijuana users, and increased prevalence and health consequences associated with cocaine use.
mesh_terms: D000163:Acquired Immunodeficiency Syndrome / Q000150:complications; D000293:Adolescent; D000328:Adult; D002648:Child; D003042:Cocaine; D004812:Epidemiologic Methods; D005260:Female; D003932:Heroin; D006801:Humans; D008297:Male; D002189:Marijuana Abuse / Q000453:epidemiology; D011159:Population Surveillance; D012306:Risk; D019966:Substance-Related Disorders / Q000453:epidemiology*
chemical_list: D003932:Heroin; D003042:Cocaine