A campus that banned smartphones made its students happier. Why? Because the phones are like any other addictive substance, says Anna Lembke, author of "Dopamine Nation": "Over time, our brains will adapt" and put us "in a dopamine deficit state...akin to a clinical depression or to an anxiety disorder. Now, we're using this substance not to feel good or get high but just to bring ourselves back up to baseline."

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