I had quite in the past, back to it again =/.
Things I did to help.
1. Brush your teeth alot, notice your gums getting healthier as incentive.
2. For a scaire find some pictures of mouth cancer or talk to your dentist, these people specialize in scare tactics.
3. Make your tin harder to get to. I wrapped it in aluminum foil, making me thing twice about opening.
4. Put the $ you haven't used on tobacco into a bank, for some reason opening it and seeing all the money was a good motivator.
5. Lots of candy, sunflower seeds and things to keep your mouth busy, while you drive or after you eat. Avoid coffee triggers that intensify the urge.
I did cold turkey and after a couple weeks I was over it.
Good luck