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Turns out getting stoned on marijuana carries much more dire consequences for teenagers than for adults — at least if you’re a rat and part of a new study released Monday by researchers in London.

Researchers at Western University’s Schulich School of Medicine & Dentistry have published a study that shows that the psychoactive component of marijuana caused long-term harm on the adolescent brains of rats, producing changes similar to what is found in schizophrenia.

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“Adolescence is a critical period of brain development and the adolescent brain is particularly vulnerable,” said Steven Laviolette, a professor in the departments of anatomy and cell biology, and psychiatry. “Health policy makers need to ensure that marijuana, especially marijuana strains with high THC levels, stays out of the hands of teenagers. In contrast, our findings suggest that adult use of marijuana does not pose substantial risk.”