A survey was given to 5,887 high school students in grades 6 through 12 in 26 school districts throughout Pennsylvania. Significant findings were reported for the importance of information and self-reported use of tobacco and beer; the importance of self-concept and self-reported use of tobacco, beer, marijuana, depressants, stimulants, and cocaine; the importance of recreational and alternative activities and self-reported use of tobacco, beer, and marijuana; the importance of school policy and self-reported use of beer, marijuana, and stimulants; and the importance of adults as models and self-reported use of tobacco, marijuana, and stimulants. In general non-users rated the decision-making variables as being more important in the decision-making process than users. 4 tables, 39 references. (Author abstract)