It's 8 weeks tomorrow since I had my last cigarette. I'm using the lozenges, Asdas own as they are much cheaper than the Nicorette ones. The first two weeks is definitely the worst. This is really the period when you need lots of self control and will power. Once you've done two weeks then I'm not saying it's a doddle, but it's a lot easier.
The way I got through the first two weeks was by just telling myself that it had to get better, that I really DID want to give up smoking, and I was going to go through it all again! Stick with it, and you'll be really proud of yourself.
btw if anyone else is thinking of giving up I recommend the lozenges. You don't suck them, you pop one on your gum and let it slowly dissolve. I only use 4 or 5 a day, and it's now nearly 8 weeks since I stopped smoking!