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."

Source: CNN