I need to quit too. My story sounds likes Rachael's on Friends. I started smoking when I started my new nursing job when I was 24. The only way to leave the floor was to go out for a smoke break. If you tried to take a break in the break room and a monitor would beep or someone needed help, your break was over. And all the cool people smoked. So I started for that very stupid reason.
Now 6 years and a career change later, I need to quit. The hardest part for me is when I drive or when I am around my friend that smokes. I feel like I am in that commercial where the guy lights up a cigarette and steals a truck. I don't have to drive when I smoke, so I guess I don't have to smoke when I drive. I think those are the behaviors I have to relearn.

