Shift in some teens' use and perceptions of marijuana after recreational marijuana is legalized

Marijuana use significantly increased and its perceived harm decreased among eighth- and 10th-graders in Washington state following enactment of recreational marijuana laws, according to a study published online in JAMA Pediatrics by UC Davis and Columbia University Mailman School of Public Health. There was no change in use or perceived harm among 12th graders or among similar grades in Colorado.

The journal also posted editorials on the impact of legalization of marijuana by Wayne Hall and Megan Weier and by Alain Joffe.

The study authors believe their research is the first in the nation to assess changes in teens' perceptions and marijuana use before and after legalized recreational use, and compare these attitudes and use in 45 other contiguous states where marijuana use is not legal.

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