I wish you the best of luck in you endeavour with giving up the ciggies.
I smoked through my first pregnancy. My OB said to keep it under 10 per day as he said it could cause me more stress to try to give up at that point and that is what I did until it came close to the end and my relationship was falling apart. My DS doesn't seem to have suffered from it but I will always feel a little guilty for not having given up then.
Since then I met my new, wonderful DH who doesn't smoke and after being with him for 18 months we got engaged and I decided I wanted to give up before we tried to have children. I tried patches but too soon discovered that you could just take them off to have a smoke.....
Zyban was my saviour, I don't even remember it being difficult to give up. I still feel the odd urge but I know too many who have given in to that and are now full time smokers again and there is no way I ever want to go back to it.
The biggest mind shift was realising that not having the cigarette was not going to kill me - having it probably would eventually.
Best wishes to you.