National survey shows continuing decline in use of illicit drugs; cocaine use drops dramatically.
D003042:Cocaine; D003430:Cross-Sectional Studies; D006801:Humans; D013287:Illicit Drugs; D015994:Incidence; D019966:Substance-Related Disorders / Q000453:epidemiology*; D014481:United States / Q000453:epidemiology
D013287:Illicit Drugs; D003042:Cocaine