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An Initiative To Legalize Marijuana In California To Appear On Nov. Ballot
One-ounce bags of medicinal marijuana are displayed at the Berkeley Patients Group March 25, 2010 in Berkeley, California.  Justin Sullivan—Getty Images

Teens Don't Smoke More Pot After Medical Marijuana Laws Passed, Study Finds

Jun 16, 2015
TIME Health
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New research has cast serious doubts on the argument that legalization of medical marijuana would lead to more widespread use among teenagers.

The study, which was published Tuesday by Columbia University researchers in the The Lancet Psychiatry, examined marijuana use among more than a million teenagers over 24 years.

The researchers found no discernible impact in the 21 states that had legalized the drug for medical use. "The risk of marijuana use in states before passing medical marijuana laws did not differ significantly from the risk after medical marijuana laws were passed," the co-authors wrote.

While researchers observed no discernible change after the laws were passed, they did find drug use rates were generally higher in states that had legalized marijuana. "State-level risk factors other than medical marijuana laws could contribute to both marijuana use and the passage of medical marijuana laws, and such factors warrant investigation," the authors concluded.

Go Inside the Harvest of Colorado's Most Controversial Marijuana Strain

Charlotte's Web Stanley Brothers Pot Weed Marijuana Colorado California
Charlotte's Web grows on the Stanley brother's farm near Wray, Colo. on Sept. 22, 2014. The Stanley Brothers have developed a popular strain of cannabis that has been found to be helpful in reducing seizures in some children. Charlotte's Web is high in a compound called cannabidiol (CBD) and low in tetrahydrocannabinol (THC) the compound that causes a high.Matt Nager for TIME
Charlotte's Web Stanley Brothers Pot Weed Marijuana Colorado California
Charlotte's Web Stanley Brothers Pot Weed Marijuana Colorado California
Charlotte's Web Stanley Brothers Pot Weed Marijuana Colorado California
Charlotte's Web Stanley Brothers Pot Weed Marijuana Colorado California
Charlotte's Web Stanley Brothers Pot Weed Marijuana Colorado California
Charlotte's Web Stanley Brothers Pot Weed Marijuana Colorado California
Charlotte's Web Stanley Brothers Pot Weed Marijuana Colorado California
Charlotte's Web Stanley Brothers Pot Weed Marijuana Colorado California
Charlotte's Web Stanley Brothers Pot Weed Marijuana Colorado California
Charlotte's Web Stanley Brothers Pot Weed Marijuana Colorado California
Charlotte's Web Stanley Brothers Pot Weed Marijuana Colorado California
Charlotte's Web Stanley Brothers Pot Weed Marijuana Colorado California
Charlotte's Web Stanley Brothers Pot Weed Marijuana Colorado California
Charlotte's Web Stanley Brothers Pot Weed Marijuana Colorado California
Charlotte's Web Stanley Brothers Pot Weed Marijuana Colorado California
Charlotte's Web Stanley Brothers Pot Weed Marijuana Colorado California
Charlotte's Web Stanley Brothers Pot Weed Marijuana Colorado California
Charlotte's Web Stanley Brothers Pot Weed Marijuana Colorado California
Charlotte's Web Stanley Brothers Pot Weed Marijuana Colorado California
Charlotte's Web Stanley Brothers Pot Weed Marijuana Colorado California
Charlotte's Web grows on the Stanley brother's farm near Wray, Colo. on Sept. 22, 2014. The Stanley Brothers have develo
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Matt Nager for TIME
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