Trajectories of Nicotine and Cannabis Vaping and Polyuse. From Adolescence to Young Adulthood H. Isabella Lanza, PhD; Jessica L. Barrington-Trimis, PhD; RobMcConnell, MD; Junhan Cho, PhD; Jessica L. Braymiller, PhD; Evan A. Krueger, PhD, MPH, MSW; Adam M. Leventhal, PhD JAMA Network Open, 2020, 3, (10), :e2019181. doi : 10.1001/jamanetworkopen.2020.19181   Abstract IMPORTANCE : Little is known about cannabis vaping trajectories across adolescence and young adulthood or the co-occurrence with nicotine vaping. OBJECTIVE : To evaluate nicotine vaping and cannabis vaping trajectories from late adolescence to young adulthood (18 years of age) and the extent of polysubstance vaping. DESIGN, SETTING, AND PARTICIPANTS : In this prospective cohort study, 5 surveys [...]