Tobacco and cannabis poly-substance and poly-product use trajectories across adolescence and young adulthood

11/3/21–This study characterized the prevalence, patterns, and racial/ethnic and sex differences of developmental trajectories of use and poly-use of 8 different widely-marketed tobacco and cannabis products across adolescence and young adulthood. 3322 AYAs from Los Angeles, California completed 5 surveys from fall of 11th grade (2015) to 1–2 years post-high school (2018–2019). Read