This paper is a companion to the book, "Smoking, Drinking, and Drug Use in Young Adulthood: The Impacts of New Freedoms and New Responsibilities," by Bachman, Wadsworth, O'Malley, Johnston, and Schulenberg (1997). The book attempts to disentangle the effects of post-high school roles on drug use by conducting a variety of analyses on data from the Monitoring the Future project. The purpose of this paper is to provide supplemental material to the book, including the full set of regression results upon which the book was written. This paper is not meant to stand alone, nor does it need to be read cover to cover; for the most part it is simply a vehicle for making accessible the data and results of analyses that did not readily fit into the book but may be useful for understanding the findings. It provides the reader with: (1) supplemental material on sample characteristics; (2) descriptive statistics of patterns of change in drug use; (3) a complete set of regression results relating post-high school roles to changes in drug use; (4) a discussion of background factors and their relationship to changes in drug use; and (5) data tables for figures which appear in Bachman et al. (1997). The body of this paper is divided into chapter corresponding to items 1 through 4. The last item includes a set of tables. (Contain 10 references and 67 tables.) (Author/JDM)