BFP !why cant i JUST STOP....10 POINTS Best ANSWER?

i just found out on sunday that iam pregnant!!! i am having such a hard time quiting smoking have only had around 3 yesterday and 1 today i have a very stressful job and i the will power thing is just killing me ! if you are pregnant or have been pregnant how did u quit i just want to give them up cold turkey and keep my little guy safe any advise would be great !!!!