For marijuana and the brain, questions remain

Two new studies out today in JAMA Psychiatry highlight the persistent questions about how cannabis might affect brain development.

In one study, twins had similar brain volume even when one used recreational marijuana and the other didn't. But in the second study, high-risk male teens who used marijuana did have changes in brain volume.

Experts agree that much remains unknown and the new findings just "scratch the surface."

"We do not know nearly enough about effects of cannabis on the brain, especially the developing brain," said Dr. David Goldman of the National Institute on Alcohol Abuse and Alcoholism in Rockville, Maryland, in email to Reuters Health.

For the twin study, researchers used interview and neuroimaging data collected between 2012 and 2014 from 71 pairs of young adult twins or siblings who had never used cannabis, 81 pairs who had both used cannabis at one point, and 89 pairs...

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