Trends from 1972 through 1985 were also examined. The participants were selected using a multistage area probability design, with oversampling of blacks and Hispanics. They were grouped into four age categories: 12-17, 18-25, 26-34, and 35 years old and older. Results showed that the decline in drug use from the peak around 1979 has continued between 1982 and 1985, but not for all age groups nor for all drugs. Earlier surveys had shown that between 1979 and 1982, the percentage of 12-17 year olds who had ever used marijuana declined slightly, while the percentage who were current users of marijuana, alcohol, and several other drugs declined significantly. Results also showed that illicit drug use is now more extensive among those 18-25 and 26-34 years old than among their younger or older counterparts. Data tables, lists of definitions, and survey instrument.