title: National surveys find higher use of marijuana by students, more heroin-related hospital visits.
mesh_terms: D006306:Health Surveys; D003932:Heroin; D006760:Hospitalization; D006801:Humans; D002189:Marijuana Abuse; D013334:Students; D019966:Substance-Related Disorders / Q000534:rehabilitation*
chemical_list: D003932:Heroin