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The Brain & the Actions of Cocaine, Opioids, and Marijuana

3D Illustration of the Human Brain

The first in a 5-part series, offers an understanding of the brain, how the reward center works, and what happens in the brain when a person uses cocaine, opioids (heroin), or marijuana.

Revised: November 2019
Author: National Institute on Drug Abuse

This page was last updated November 2019