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ABSTRACT
This study examined family-based variables as predictors of adolescent substance use. Parental education level, ethnic background, religious affiliation, sibling substance use, family conflict, and family involvement were the specific family-based variables examined. Five thousand and five randomly sampled adolescents in the state of Utah participated in this study. Responses of 4,983 adolescents were included in the data analysis. Overall, this study supported prior research, indicating certain family variables as predictors of adolescent substance use. Sibling marijuana use, family involvement, and religious affiliation were predictors of adolescent tobacco use. Family involvement, sibling tobacco use, and religious affiliation were predictors of adolescent alcohol use. Family involvement, sibling alcohol use, and religious affiliation were predictors of marijuana use. Future implications for research and practice in relation to family-based risk and protective factors are discussed.