Two tips.
First one - get somebody really close to you to ask you to stop smoking for them, after that, every cigarette you have will make you think of that person and when you've established a feeling of guilt with each ciggy, it makes the experience less pleasurable.
Second one - the one that worked for me on New Years Day 2012 - not even had an urge to buy one since. Get absolutely battered on Jack Daniels, to the point where you're alive, but only just...only joking, just make sure you don't eat carbs before hand, just make sure you get a killer hangover, and whilst drinking the Jack, try having about 20-30 cigs during the night. The next day, the smell of a cigarette should make you want to vom, and in my case, this applied to the following 2 days also. When you're 3 days without a cig, you're half way there. Every time you want a cig, have a brew, a strong (two teabags if necessary) brew should subside the craving for an hour or so, and keep yourself busy. Do this, it might feel like torture, for another 3 days. After 6 days you're home and dry almost, but there's one last thing that I did, that helped a lot and I know a lot of people couldn't make this sacrifice, I didn't drink for 2 months (when I drank I always used to smoke more), but after 3/4 weeks the cravings completely subsided altogether and I was just not drinking because I had no reason to. I have had a few sessions since and not even contemplated stepping outside for a quick smoke.
Another way to get over that initial 7 day period without smoking is to get a wisdom tooth pulled, and when you think of going for a cig during any of the proceeding 7 days, just before you reach for your lighter - go onto google and type in "dry socket", which is apparently one of the worst pains known to man, if you proceed to light up, you're a nutter. Although I started again after 10 days which was stupid of me, but I guess you have to want to stop for any of the methods to work.