Data from the "Monitoring the Future" study follow-up studies on drug use of young adults post-high school are presented. An introduction, overview of key findings, and study design and procedures (including discussions of validity and representativeness) are provided. Follow-up procedures and sampling issues are discussed. This report is focused on college students defined as "high school graduates one to four years past high school who are enrolled in a two-year or four-year college," and young adults "in the class cohorts one to fourteen years beyond high school (modal ages 19 to 32)." Lifetime prevalence estimates are presented and discussed. Trends in drug use among young adults are reported with comparisons of subgroups for gender, regional differences and population density. "Attitudes and beliefs about drug use" and "the social milieu for young adults" are discussed in relation to trend data. Prevalence data for 1997 is presented and gender subgroups are compared; trends among college students are summarized. Data is provided in statistical tables and figures. This volume stands alone as data from Volume 1 necessary for interpretation is repeated. (EMK)