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NIDA

Illegal Drugs

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Marijuana (Mind Over Matter)

Published January 1997. Revised August 2014.
Explains how THC, the active ingredient in marijuana, causes changes in the brain that affect memory, emotions, balance, and judgment. En Español

Opioids (Mind Over Matter)

Published January 1997. Revised September 2014.
Describes how opioids, such as Vicodin, morphine, heroin, and codeine, affect the brain, the nervous system, and the limbic system, which controls emotions. En Español

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