adolescents, though variation in the extent and rate of decrease across racial/ethnic groups
is inadequately understood. Methods The present study utilized nationally-representative
data in Monitoring the Future from 2006 to 2015 to examine trends over time in past 30-day
marijuana use. We examine whether differences in trends over time by race and ethnicity
also differ by individual-level, school-level, and state-level factors. Sample included 131,351 …