If a woman does manage to get pregnant inspite of the increase chances of infertility and continues smoking when pregnant, the unborn baby gets affected by the chemicals from the cigarette. They are more prone to premature birth, low birth weight. There is also an increased risk for premature rupture of the amniotic sac, placenta previa( a condition where the placenta is placed in an unusual position in the uterus), miscarriage, and neonatal death. It has also been found that new borns whose mothers smoked during pregnancy have the same nicotine levels in their bloodstream as adults who smoke. The child goes through withdrawal symptoms from the first day of its life, just like an adult would.