I gave up at New Year and have somehow managed to stick at it. But I did have a horrible cough for several weeks and felt very tired and irritable. I was never a heavy smoker, 10 a day max and usually a lot less, so it was probably easier for me than for a lot of people. I sometimes get the odd craving after a couple of drinks, but no way would I start again. Apart from anything else, it's too blooming expensive.
Stick at it, eyesh, you're doing brilliantly. You'll probably be feeling great in a couple of weeks time.