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Marijuana use has been decreasing in the past several years among adolescents, though variation in the extent and rate of decrease across racial/ethnic groups is inadequately understood.

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 8th grade students, 137,249 10th grade students, and 123,293 12th grade students; multi-level models and difference-in-differences tests were used.

In 10th grade, Black students had a positive linear increase in marijuana use (est = 0.04, SE = 0.01, p < 0.001), and the magnitude of the increase was significantly greater than among non-Hispanic White students (est = 0.38, SE …