Co-use of tobacco and marijuana among young people experiencing homelessness in Los Angeles County

INTRODUCTION. Tobacco and marijuana co-use among young people in the U.S. is a public health concern that deserves greater attention. This study addresses a significant gap in the literature by examining the prevalence and correlates of tobacco and marijuana co-use among young people experiencing homelessness. METHODS. The analytic sample consisted of 449 unaccompanied homeless youth (mean age=22; 72% male) who had used any type of tobacco product in the past 30 days. Participants were recruited from 12 service sites and 13 street sites in Los Angeles County. RESULTS. Over 90% of young homeless tobacco users reported past month marijuana and tobacco co-use: 65% reported any co-administration (mixing both substances in a cigarette, joint, blunt, bong, hookah, pipe or bowl) and 27% reported only using them separately. Analysis of covariance tests found that co-administrators reported greater quantity and frequency of tobacco cigarette use, more frequent marijuana use, and, in some cases, poorer functioning and more severe homelessness compared to other tobacco users (p