Drugs and other stimuli hijack dopamine signaling in the brain, causing changes that can lead to addiction
This article was originally published with the title "Addiction"
Dwayne Godwin is a neuroscientist at the Wake Forest University School of Medicine.
Jorge Cham draws the comic strip Piled Higher and Deeper at www.phdcomics.com. He is also co-author of the new book We Have No Idea: A Guide to the Unknown Universe, published by Riverhead Books.
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