Will smoking 2-3 cigarrettes a day harm my baby?

I have just found out I'm 19 weeks pregnant up until now I had no idea but now I'm worried that when I smoked before I found out that it could harm my baby. I usually only have around 2 or 3 a day, sometimes more or less, and not every single day but most days. Will this affect my baby? I heard that around 3 a day doesnt cause any damage?

Btw I know alot of people are against smoking during pregnancy as am I so please no rude or unhelpful comments

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