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The Science of Substance Abuse

September 9, 2009 2:22 p.m.

Why do we derive pleasure from using substances that are not good for us? What's going on in our bodies and our brains that allows us to enjoy the effect of chemicals that can potentially kill us? And why in the world didn't evolution take care of this problem a long time ago? We'll talk to scientists about what happens to the body when you use cigarettes, alcohol and marijuana.

Related Story: The Science of Substance Abuse