Are they champix?
DH was on them, he didn't stop smoking and it completely screwed his sleeping patterns. He'll say he wasn't moody but he was, very much so!

to be completely honest I think anything can work but you have to be at a point where you want to give up for yourself not because of your health or money or anything like that. My DH just doesn't want to give up smoking at the moment, he enjoys it.

He's tried everything other than hypno and nothing has worked yet.