The authors noted that because older studies are based on the effects of marijuana containing lower levels of THC—the primary psychoactive chemical in cannabis—stronger adverse health effects may occur with the use of today’s more potent marijuana. They emphasized that more research must be done on the potential health consequences of second-hand marijuana smoke, the long-term impact of prenatal cannabis exposure, and effects of marijuana legalization policies on public health.
"It is important to alert the public that using marijuana in the teen years brings health, social, and academic risk,” said lead author and NIDA Director Nora Volkow, M.D. “Physicians in particular can play a role in conveying to families that early marijuana use can interfere with crucial social and developmental milestones and can impair cognitive development.”
To read more about the use of marijuana among teens and legislation concerning marijuana use in this population, see the Psychiatric News articles, “News Is Mixed on Teenagers and Substance Use” and “Marijuana Legalization and Young Brains: Time for Serious Study.”