Drugs, drinking, sex... they are all sources of dopamine. Agree? Trump gets his dopamine hit from business conquest. I love work, business, negotiation, etc. I get a rush too. But, I have never seen anyone like Trump. That's what he lives for. People call him "selfish" for this, but keep in mind, a President being "selfish" with other nations is actually acting in your best interest. His role as President has given him a dopamine hit we can never imagine.. who needs drugs when you have that?