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The following is an archived video story. The text content of that video story is available below for reference. The original video has been deleted and is no longer available.

Study: Casual pot use can damage brain

Chicago -- Smoking marijuana, even casually, can cause damage to critical parts of the brain, according to a new study published in the Journal of Neuroscience.

Researchers at Northwestern University found that those who used marijuana as little as once per week damaged parts of the brain that control emotion and motivation, and are linked to some types of mental illness.

The more frequently subjects smoked, the more damage researchers found.

 
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