摘要：

Monitoring the Future (MTF), now in its 41st year, is a research program conducted at the University of Michigan's Institute for Social Research under a series of investigator-initiated, competing research grants from the National Institute on Drug Abuse--one of the National Institutes of Health. The study comprises several ongoing series of annual surveys of nationally representative samples of 8th- and 10th-grade students (begun in 1991), 12th-grade students (begun in 1975), and high school graduates followed into adulthood (begun in 1976). The current monograph reports the results of the repeated cross-sectional surveys of all high school graduating classes since 1976 as researchers followed them into their adult years. Segments of the general adult population represented in these follow-up surveys include: (1) U.S. college students; (2) their age-peers who are not attending college, sometimes called the "forgotten half"; (3) all young adult high school graduates of

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