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The Monitoring the Future (MTF) annual survey of about 50,000 students nationwide conducted by the Institute for Social Research at the University of Michigan began studying 12th graders in 1975 and added 8th and 10th graders in 1991. In 2005, for the fourth year in a row, overall drug use continued to decline among the nation’s 10th and 12th graders; however, 8th graders, whose drug use had been steadily declining since 1996, had no further decline.
In 2005, 21% of 8th graders, 38% of 10th graders, and 50% of 12th graders reported having ever tried an illicit drug (lifetime use). Use in the past 12 months (annual use) was reported by 16%, 30%, and 38%, respectively. As in earlier surveys, marijuana was the illicit drug used most often by 10…