I went through the same question about 22 years ago.I do not judge but I will give my own view at the time for myself.

I quit cold turkey.For me I did so out of fear.I was scared enough feeling insecure about becoming a Mother I decided to do everything by the book.I ate healthy,did yoga etc..I nursed for 13 months and then I started smoking again...It is a difficult decision to make.I rather be "safe"than sorry