Marijuana Regulation and Teen Use Rates

Since the mid-1990s, self-reported lifetime use of cannabis has fallen 46 percent among 8th-graders, 25 percent among 10th-graders, and ten percent among 12th-graders.

Since 2002, perceived availability of marijuana among young people has fallen dramatically nationwide.

Rates of problematic cannabis use by young people has declined 24 percent between 2002 and 2013.

The enactment of medical cannabis laws is not associated with any causal upticks in youth marijuana use

  • "This systematic review screened 2999 unique papers retrieved from 17 sources, yielding 21 unique studies. Ultimately, 11 studies passed secondary exclusion criteria designed to ensure optimal study quality. ... [A]ll estimates of pre–post changes in past-month marijuana use within MML (medical marijuana law) states from these studies were non-significant. ... In summary, current evidence does not support the hypothesis that MML passage is associated with increased marijuana use prevalence among adolescents in states that have passed such laws."
  • "We aimed to examine the availability of medical marijuana dispensaries, price of medical marijuana products, and variety of medical marijuana products in school neighborhoods and their associations with adolescents’ use of marijuana and susceptibility to use marijuana in the future. ... The distance from school to the nearest medical marijuana dispensary was not associated with adolescents’ use of marijuana in the past month or susceptibility to use marijuana in the future, nor was the weighted count of medical marijuana dispensaries within the 3-mi band of school. Neither the product price nor the product variety in the dispensary nearest to school was associated with marijuana use or susceptibility to use. The results were robust to different specifications of medical marijuana measures. ... There was no evidence supporting the associations of medical marijuana availability, price, or product variety around school with adolescents’ marijuana use and susceptibility to use."

The passage of adult use cannabis laws is not associated with any causal upticks in youth marijuana use in those jurisdictions that have enacted them