From The New York Times:
In the communal imagination, dopamine is about rewards, and feeling good, and wanting to feel good again, and if you don’t watch out, you’ll be hooked, a slave to the pleasure lines cruising through your brain. Hey, why do you think they call it dopamine?
Someone could make a fortune if he could bottle the stuff and sell it.
Dopamine comes packaged in many forms — one of which is bottled and sold at the liquor store. Another is packaged in fine boxes and sold at the chocolate confectionary. Yet another form is rolled in long, thin sticks and sold at tobacconists. It’s hard to imagine the diverse selection of products that are popular mostly because they stimulate human’s dopamine circuits.