Major findings from the survey include: in 1990, 37 percent of households reported ever having used one or more illicit drugs in their lifetime, 13 percent reported using illicit drugs within the past year, and 6 percent reported using them within the month prior to the survey; almost 83 percent of households had ever used alcohol, 66 percent had used alcohol within the past year, and 51 percent within the past month; marijuana was the most commonly used drug in 1990, with 33 percent of those 12 and older ever having used the drug; and the use of any illicit drug in the past month was highest among young adults aged 18 to 25, males, Blacks, residents of large metropolitan areas, and residents of the West. This report from the National Institute on Drug Abuse presents highlights from the 1990 National Household Survey on Drug Abuse. Data were collected through surveys of a representative sample of 9,259 individuals from the household population. Age, sex, race/ethnicity, region, and population density groups were the primary correlates used for stratifying the sample. The tables contain estimates for specific drugs and drug classes that include marijuana, cocaine (including crack), inhalants, hallucinogens (including PCP), heroin, nonmedical use of prescription-type psychotherapeutic drugs (stimulants, sedatives, tranquilizers, and analgesics), alcohol, cigarettes, and smokeless tobacco. Tables, figures, appendixes