A peer assistance program for teenage substance users was developed in which students interviewed their peers to determine substance use attitudes and frequency of substance use. Student interviewers read and studied drug curriculum materials in their health class; were taught active listening skills and counseling techniques; practiced answering questionnaires and surveys designed to clarify teenage substance use issues; interviewed peer substance users; and wrote essays on substance use issues. The target group of peer substance users was chosen by survey results from high school juniors and sophomores. Target teenagers were assigned an interviewer who assisted the substance user by providing substance use clarification. A Pre-Interest Inventory Likert scale measured substance use interest by high school juniors, while five sets of questionnaires and a Post-Interest Inventory Likert scale measured how the peer assistance program had influenced teenage substance users' attitudes. While the Post-Interest Inventory results showed that a high number of teenagers chose to be drug-free at the project's conclusion, it was the peer interviewers who benefitted by their participation in the helping relationship. Program implementation was recommended because of low cost, use of existing staff, and the program's ability to clarify substance use issues for teenagers through peer interviews. (Relevant forms and questionnaires are appended.) (Author/NB)