Yes, my doctor told me if I stopped cold turkey it could put way to much stress on myself and baby and could send me inter a miscarriage. But I don't smoke more than 4 a day sometimes only 2. Right now I'm down to 1 a day.
I smoke and have my entire pregnancy, my pregnancy has been perfect with zero complication and have always had perfect blood pressure and have gained only 35lbs the entire way through, and my son is perfectly healthy and still growing like a weed, my doctor doesn't say anything to me about it because it's been such a perfect pregnancy for someone my age.
I was a smoker for 7 years, until I found out I was pregnant. I think I was about 10 wks or so, but I quit cold turkey. Definitely difficult, but must be done.