Skip to content Skip to footer
|

Study: Medical Marijuana Legalization Is Not Accompanied by Increases In Teen Cannabis Use

The legalization of cannabis for therapeutic purposes is not associated with increases in the use of marijuana or other illicit substances among adolescents, according to discussion paper commissioned by the Institute for the Study of Labor (IZA) in Germany.

The legalization of cannabis for therapeutic purposes is not associated with increases in the use of marijuana or other illicit substances among adolescents, according to discussion paper commissioned by the Institute for the Study of Labor (IZA) in Germany.

Economists from Montana State University, the University of Oregon, and the University of Colorado, Denver examined the relationship between state medical cannabis laws and marijuana consumption among high school students. Authors analyzed data from the national and state Youth Risky Behavior Surveys (YRBS) for the years 1993 through 2009 – during which time 13 states enacted law allowing for the production and use of cannabis for medicinal purposes.

The national YRBS is conducted biennially by the Centers for Disease Control and Prevention (CDC) and is a nationally representative sample of U.S. high school students.

Authors reported that the survey data provides no evidence that the enactment of medical cannabis legalization adversely impacted adolescents’ drug consumption. They concluded: “Our results are not consistent with the hypothesis that the legalization of medical marijuana caused an increase in the use of marijuana and other substances among high school students. … “Our results suggest that the legalization of medical marijuana was not accompanied by increases in the use of marijuana or other substances such as alcohol and cocaine among high school students. Interestingly, several of our estimates suggest that marijuana use actually declined with the passage of medical marijuana laws.”

A 2012 study by researchers at McGill University in Montreal and published in the journal Annals of Epidemiology previously reported similar findings, concluding: “[P]assing MMLs (medical marijuana laws) decreased past-month use among adolescents … and had no discernible effect on the perceived riskiness of monthly use. … [These] estimates suggest that reported adolescent marijuana use may actually decrease following the passing of medical marijuana laws.”

Previous investigations by research teams at Brown University in 2011 and Texas A&M in 2007 made similar determinations, concluding, “[C]onsistent with other studies of the liberalization of cannabis laws, medical cannabis laws do not appear to increase use of the drug.”

The findings of these studies contradict public statements made by Drug Czar Gil Kerlikowske and other medical cannabis opponents, who in recent years have repeatedly alleged that the passage of medical cannabis laws is directly responsible for higher levels of self-reported marijuana consumption among US teenagers.

Help us Prepare for Trump’s Day One

Trump is busy getting ready for Day One of his presidency – but so is Truthout.

Trump has made it no secret that he is planning a demolition-style attack on both specific communities and democracy as a whole, beginning on his first day in office. With over 25 executive orders and directives queued up for January 20, he’s promised to “launch the largest deportation program in American history,” roll back anti-discrimination protections for transgender students, and implement a “drill, drill, drill” approach to ramp up oil and gas extraction.

Organizations like Truthout are also being threatened by legislation like HR 9495, the “nonprofit killer bill” that would allow the Treasury Secretary to declare any nonprofit a “terrorist-supporting organization” and strip its tax-exempt status without due process. Progressive media like Truthout that has courageously focused on reporting on Israel’s genocide in Gaza are in the bill’s crosshairs.

As journalists, we have a responsibility to look at hard realities and communicate them to you. We hope that you, like us, can use this information to prepare for what’s to come.

And if you feel uncertain about what to do in the face of a second Trump administration, we invite you to be an indispensable part of Truthout’s preparations.

In addition to covering the widespread onslaught of draconian policy, we’re shoring up our resources for what might come next for progressive media: bad-faith lawsuits from far-right ghouls, legislation that seeks to strip us of our ability to receive tax-deductible donations, and further throttling of our reach on social media platforms owned by Trump’s sycophants.

We’re preparing right now for Trump’s Day One: building a brave coalition of movement media; reaching out to the activists, academics, and thinkers we trust to shine a light on the inner workings of authoritarianism; and planning to use journalism as a tool to equip movements to protect the people, lands, and principles most vulnerable to Trump’s destruction.

We urgently need your help to prepare. As you know, our December fundraiser is our most important of the year and will determine the scale of work we’ll be able to do in 2025. We’ve set two goals: to raise $76,000 in one-time donations and to add 1156 new monthly donors by midnight on December 31. And right now, your gift will be matched dollar for dollar.

We’re asking all of our readers to start a monthly donation or make a one-time donation – as a commitment to stand with us on day one of Trump’s presidency, and every day after that, as we produce journalism that combats authoritarianism, censorship, injustice, and misinformation. You’re an essential part of our future – please join the movement by making a tax-deductible donation today.

If you have the means to make a substantial gift, please dig deep during this critical time!

With gratitude and resolve,

Maya, Negin, Saima, and Ziggy