The post title is a copy and paste from the first and fourteenth paragraphs of the linked popular press article here:
Marijuana use among young people in the United States overall has climbed in recent years, but a new paper suggests that in states where recreational marijuana has been legalized, marijuana use among youth may actually be falling.
The researchers wrote in the paper that one possible explanation could be that in states where recreational marijuana is legal, “it is more difficult for teenagers to obtain marijuana as drug dealers are replaced by licensed dispensaries that require proof of age.”
Association of Marijuana Laws With Teen Marijuana Use
New Estimates From the Youth Risk Behavior Surveys
D. Mark Anderson, PhD1; Benjamin Hansen, PhD2; Daniel I. Rees, PhD3; et al Joseph J. Sabia, PhD4
JAMA Pediatrics Published online July 8, 2019.
In the United States, 33 states and the District of Columbia have passed medical marijuana laws (MMLs), while 10 states and the District of Columbia have legalized the recreational use of marijuana. Policy makers are particularly concerned that legalization for either medicinal or recreational purposes will encourage marijuana use among youth. Repeated marijuana use during adolescence may lead to long-lasting changes in brain function that adversely affect educational, professional, and social outcomes.