Huge sympathy. And well done for posting. I say that as someone who didn't manage to entirely quit during my pregnancy, I had maybe 4 a week for most of my pg even though I knew how terrible it was.
The thing is, it can be a bit of a vicious cycle. Most smokers use cigarettes as a crutch when they are stressed, anxious etc. Knowing that you are smoking when you shouldn't be makes you stressed and anxious. And, sadly, not everyone has a magic switch that makes them hate cigarettes when pg.
Firstly, please be aware that you are not the first or only woman still smoking while pg. For one reason or another, plenty of women struggle to quit when pg. So please don't think you are alone in smoking.
Secondly, focus on how much good not having just one cigarette will do your baby. If you feel like you want one, try and put it off for a while. See if over a day that helps you cut out one or two or maybe even more cigarettes.
Also, experiment with nicotine replacement. Obviously they are not ideal either, but they are better than cigarettes (though I believe the patches are not recommended). I found the spray better than the rest.
I am sure your baby will be fine, as others have said. Please try not to worry. And remember you are not alone - come back and talk, or PM me, if you want to talk to someone.