I smoke, 8 quit attempts and the longest I made it was 6 months. It's definitely holding me back. Good news is I've gone down from 4 to 5 packs a day to 1. That was really hard. The worst part of trying to quit is the first two weeks. I wake up with the shakes and throw up. My body is really physically addicted to nicotine. If I don't have it I get seriously ill. Wish I'd never lit the first one.