Most alcohol use among young people occurs in a social context, and peer substance use has long been established as an important predictor of alcohol and other substance use among youngsters. (sciencedaily.com)
Many people who experience problems with gambling experience other substance use or mental health conditions, and smoking is a common one. (basisonline.org)
Lifetime tobacco, alcohol and other substance use in adolescent Minnesota twins: univariate and multivariate behavioral genetic analyses (cambridge.org)