I don't smoke, but I know few people who does and I know few poeple who has quitted smoking with good results. The best way to quit up smoking seems to be just simply to decide to quit - now - and just quit smoking. You can do other tricks if you like and if they help you, but basic motivation has come inside of you.
Quit smoking is usually difficult to the persons that have become nicotine addictive ones.
I guess that we all know what smoking does to a man and that passive smoking has same effect. It also destroys rainforests and it's unethical to advertise smoking and cigarrets to the third world - where people have enough difficulties to survive daily life even without smoking.
If you quitted smoking immediately after you thought you were pregnant, you should just keep it going that way (non-smoking), whether you weren't pregnant, this time. Smoking also is one of the many reasons that weakens womens ability to get pregnant. It also weakens males sperm and erection which effects directly too to getting a female pregnant.
Good luck with it, Molly! You can do it!
