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Study: Adult-Use Cannabis Regulations Associated with Falling Teen Use

Thursday, 11 July 2019

Bozeman, MT: The enactment of laws regulating the use of cannabis by adults is associated with short-term declines in self-reported marijuana use by young people, according to findings published in the journal JAMA Pediatrics.

A team of researchers from Montana State University, the University of Oregon, the University of Colorado, and San Diego State University assessed teen marijuana use rates, as reported by the Youth Risk Behavior Survey, in states that had legalized either the medical or the recreational use of cannabis.

After adjusting for individual and state-level covariates, authors reported that states with "recreational marijuana laws were associated with an eight percent decrease in the odds of marijuana use and a nine percent decrease in the odds of frequent marijuana use." By contrast, states with medical cannabis laws only were not associated with any statistical changes in youth use.

They concluded: "Consistent with the results of previous researchers, there was no evidence that the legalization of medical marijuana encourages marijuana use among youth. Moreover, the estimates reported ... showed that marijuana use among youth may actually decline after legalization for recreational purposes. This latter result is consistent ... with the argument that it is more difficult for teenagers to obtain marijuana as drug dealers are replaced by licensed dispensaries that require proof of age."

Commenting on the study's conclusions, lead researcher Mark Anderson of Montana State University said: "There is simply no evidence that legalization – for medical or recreational purposes – leads to an increase in teen use. Opponents of these laws generally state this as a primary concern, but there is just no evidence that teen consumption goes up."

NORML State Policies Coordinator Carly Wolf added, "Ensuring the safety of our kids is always a top priority. The best way to do that is to regulate cannabis, bring products behind a counter, and phase out the illicit market."

For more information, contact Paul Armentano, NORML Deputy Director. Full text of the study, "Association of marijuana laws with teen marijuana use," appears in JAMA Pediatrics. Additional information is available in the NORML fact-sheet, "Marijuana Regulation and Teen Use Rates."