The contribution of this research is in the area of adolescent decision making. The specific decision examined is the decision to use or not use drugs. Several factors were expected to have significant impacts on this crucial adolescent decision. These factors included peer, school, family, and religion influences. The source of the data was a sample of ninth through twelfth grade students in a north Texas city. The students responded to a survey questionnaire in the spring semester of 1989. A total of 632 students responded to the questions about alcohol- and drug-related attitudes, beliefs, and behaviors. Four major hypotheses were tested, and each one was supported by the research findings. In the first hypothesis, it was expected that family drug use factors would have a positive effect on adolescent drug use. Family factors included the following: parental use of alcohol, problems for family members due to parental drinking, and problems for the respondent due to parental drinking. Family factors had a statistically significant effect on alcohol use and any drug use.