I have quit, I quit about 6 weeks into my pregnancy and haven't had one since. I wanted to quit, but didn't think I could, and then morning sickness really kicked in about 6 weeks and I couldn't handle cigarettes anymore..... I haven't had one since, but have been craving them this last week. Haven't given in, which is amazing since Shel still smokes and its all there on the coffee table (thanks darl!), but I have to say I have had to walk around the backyard breathing in the fresh air and reminding myself why I'm doing it...
Everyone says it'll get easier, though it was easier when I was feeling sick!