The tenth study in a series of national surveys to measure the prevalence of drug use among the American household population aged 12 and over. Over 9,000 households were interviewed. Covers: marijuana, cocaine, crack, inhalants, hallucinogens, any psychotherapeutics, stimulants, sedatives, tranquilizers, analgesics, alcohol, cigarettes, smokeless cigarettes, PCP, heroin and needle use.