I was a smoker for nearly 15 years before getting pregnant with my dd. I never had another cigarette after I got that positive test. I am not a person who is known for her willpower but I just couldn't do it. The thought that I was smothering my baby by compromising her oxygen supply just put me right off it.
I honestly think the only way to quit cigarettes is cold turkey, for the majority of people.
I wish you all the best, it's very hard and you need lots of support (and distractions!)