Youth marijuana use declined in 19 out of 21 states that legalized adult-use marijuana—with teen cannabis consumption down an average of 35 percent in the first states to legalize a decade ago—according to government data compiled by a leading advocacy group.
The Marijuana Policy Project (MPP) report analyzed multiple studies on how state cannabis laws influence youth use trends, including several led by federal agencies. The group found that the “data is unequivocal,” Karen O’Keefe, director of state policies at MPP, said. “Legalization does not increase youth cannabis use,” she said, pushing back on an argument often made by opponents of the reform. “In fact, evidence suggests the opposite. By transitioning cannabis sales from the illicit market to a regulated system with age-restricted access, we’ve seen a decrease in youth cannabis use.”
The report cited data from a series of national and state-level youth surveys, including the annual Monitoring the Future (MTF) Survey, which is supported by the National Institute on Drug Abuse (NIDA). The latest version of the MTF released last month found that cannabis use among 8th, 10th and 12 graders is now lower than before the first states started enacting adult-use legalization laws in 2012. There was also a significant drop in perceptions by youth that cannabis is easy to access in 2024 despite the widening adult-use marketplace. Another recent survey included in MPP’s analysis came from the Centers for Disease Control and Prevention (CDC), which also showed a decline in the proportion of high-school students reporting past-month marijuana use over the past decade, as dozens of states moved to legalize cannabis.
