Marijuana Doesn't Shrink Brains, But It Can Change Them, Studies Find

Marijuana doesn't appear to shrink important regions of the brains of users, but a study published Wednesday shows something possibly more subtle and important: the brains of people who tend to use marijuana may be smaller to start with.

A second study found that marijuana appears to change the brain structure of young men with a high genetic risk of schizophrenia.

The studies, both published in the Journal of the American Medical Association's JAMA Psychiatry, don't paint a clear picture of anything, says Dr. David Goldman of the National Institute on Alcohol Abuse and Alcoholism.

"It's probably more a story of what we don't know than what we do know," Goldman, who wrote a commentary on the reports, told NBC News. It does not mean that cannabis is safe, he stressed.

"IT'S PROBABLY MORE A STORY OF WHAT WE DON'T KNOW THAN WHAT WE DO KNOW."

In the first study,...

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