another thing about smoking is that it can increase the risk of the baby getting sick once it's born, I think it can cause meningitis when a smoker kisses a baby... Can't remember all the details but bottom line is that smoking whether it is passive or you smoking is incredibly bad for you babys little lungs!
I was a smoker and I quit the night I found out I was PG and have not hung around smokers since.... You are the only person that can protect your baby rght now!!!

Good luck darling!!!!