title: Students' use of illicit drugs continues to drop, but rates in younger students surprise investigators.
mesh_terms: D000293:Adolescent; D006801:Humans; D013287:Illicit Drugs; D013334:Students; D019966:Substance-Related Disorders / Q000453:epidemiology*; D014481:United States / Q000453:epidemiology
chemical_list: D013287:Illicit Drugs