In 2012 and afterwards California 12th graders as compared to their peers in other states became (a) 25% more likely to have used marijuana in the past 30 days, (b) 20% less likely to perceive regular marijuana use as a great health risk, (c) 20% less likely to strongly disapprove of regular marijuana use, and (d) about 60% more likely to expect to be using marijuana five years in the future. Analysis of 10th graders raises the possibility that the findings among 12th graders may reflect a cohort effect that was set into place two years earlier.
Links
[1] http://www.ijdp.org/article/S0955-3959(15)00012-2/fulltext
[2] http://rethinkpot.org/tags/ijdp
[3] http://rethinkpot.org/tags/youth
[4] http://rethinkpot.org/tags/trends