Having Caffeine!!!!!! I drink a lot of coffee each morning and a monster in the afternoon. If I don't have caffeine, I get terrible headaches. Guess I need to stock up on aspirin.
When I think of a vice, I think of a bad habit. Don't get me wrong, I enjoy A/C and would hate a world without it. I just don't know if it would be a vice. Maybe I'm wrong.
grow some coffee
http://www.gurneys.com/grow_your_own_coffee