Marijuana use among adolescent multiple tobacco product users and unique risks of dual tobacco and marijuana use.

Background: Adolescence is a peak time for uptake of both tobacco and marijuana (dual use). This study aimed to identify clusters of lifetime tobacco and marijuana use patterns and associated risk factors, and to determine whether dual tobacco and marijuana use is uniquely associated with greater risk than use of either tobacco or marijuana alone.

Method: High school students participated in a survey during Fall 2014 (N = 976; 68% Hispanic; 57% parental education < high school).