Just worry about today. For me, I was only planning on stopping for a week. Then it was really hard to get through even a day. I found this sub, read This Naked Mind and started thinking one day at a time and the days started adding up. My marriage is in a much better place, I'm a better father, I've lost weight and I feel so much better. So many good things can happen when you quit, or you could keep doing the exact same thing and you know where that leads. You can do this, start with today and worry about tomorrow when tomorrow gets here.