You need to find what works for you. For some it will be thinking of the baby, telling yourself you just can't have one etc. etc. For me, telling myself I was 'stopping' altogether, that's it no more Nick-O-Teen for me, didn't work. What did work, was telling myself when a craving hit that I wasn't going to have one this time but if I still wanted one later, then I could. Made it seem more manageable and basically I learnt that as bad as a craving feels that it does actually go away without having to have a cigarette. Just takes 5-10 mins and not all day. And once you've learnt that, it's reasonably simple to give up and gradually the cravings go away.