I find quitting to be nearly impossible. I've done it many times and within a week to a month I'm smoking again.
What I find easier to do, and while I;'ve also failed at this I've had much better luck with it, is to just smoke less.
Stop buying packs, mooch off a friend. Make sure to do something nice for this friend in return, but just smoke the occasional cigarettes off him. Try to smoke no more than one a day. Maybe if you go out on the weekend feel free to smoke if you're drinking.
Make it as easy as possible for yourself. Don't punish yourself for giving in and having one. Just try to focus on smoking less.
Sometimes when I do this I pick up my habit quite quickly, sometimes I've fully quite like this for upto a year. Right now I smoke at the very most 2-3 cigarettes a week and sometimes go a month or two without them entirely. This has been going on at this rate for nearly a year.

Slowly like this you'll stop enjoying cigarettes as much. Sure, occasionally you'll still want one and it wil be heaven on earth, but you will find that once you start to really smoke less you notice the bad aspects of smoking more. If you're down to 2 ciggies a week and then go out and get drunk and smoke a pack in one night, you will feel terrible the next day. You will feel gross. And you probably wont smoke a cig for at least a week. When you're only smoking 2 or 3 a week you're gonna hate the way your hands smell after you smoke. So once again, that's gonna keep you from smoking. After a year you might not be smoking at all.

Or you could try to quit cold turkey, deal with the crankiness for a month or two and then cave and start smoking again.

I went from a pack and a half a day to barely ever smoking. I consider this a pretty good accomplishment.