For me it would probably be coffee..
Most Helpful Guy
I don't smoke, I don't drink alcohol and I also don't drink coffee... so the hardest thing to give up would probably be sex. Chocolate and desserts would also be very hard to give up. Plus, as a literature student, I have to say that reading (and watching movies) would also be very hard to give up.1
Most Helpful Girl
Internet, for sure.1