![]() ![]() ![]() ![]() In a sensitivity analysis, they also compared Washington and Colorado data with 20 states with medical marijuana laws but no recreational marijuana laws results were unchanged. that did not legalize recreational marijuana use. The authors compared Washington and Colorado with 45 other states in the contiguous U.S. The survey measures drug, alcohol and cigarette use and related attitudes among adolescent students nationwide. The researchers compared data on the perceived harmfulness of marijuana use to health and self-reported marijuana use for nearly 254,000 Colorado and Washington state students in the eighth, 10th and 12th grades who participated in the Monitoring the Future survey. Among older adolescents in Washington state and all adolescents surveyed in Colorado, there were no changes in perceived harmfulness or marijuana use in the month after legalization. ![]() The data showed that legalization of recreational marijuana use significantly reduced perceptions of marijuana's harmfulness by 14 percent and 16 percent among eighth and 10th graders and increased their past-month marijuana use by 2 percent and 4 percent in Washington state but not in Colorado.Īmong states without legalized marijuana use, the perceived harmfulness also decreased by 5 percent and 7 percent for students in the two grades, but marijuana use decreased by 1.3 percent and. The authors believe the study 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. There was no change in use or perceived harm among 12th graders or among similar grades in Colorado. 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 UC Davis and Columbia University Mailman School of Public Health to be published online in JAMA Pediatrics. ![]()
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