My suggestion is to reward yourself for at least 3 months with the money saved by not smoking.
Give up for a week.....maybe a nice meal out somewhere. 3-4 weeks maybe a weekend away etc.
You need to add up how much you are spending and spend it on yourself on items you wouldn't usually buy. By spoiling yourself and having something nice will make you feel better.
Strange maybe, but worked for me.
Cheers
The Hedge