Compared with women who do not smoke:
• Women who smoke prior to pregnancy are about twice as likely to experience a delay in conception and have approximately 30% higher odds of being infertile.
• Women who smoke during pregnancy are about twice as likely to experience premature rupture of membranes, placental abruption, and placenta previa during pregnancy.

Babies born to women who smoke during pregnancy:
• Have about 30% higher odds of being born prematurely.
• Are more likely to be born with low birth weight (less than 2500 grams or 5.5 pounds), increasing their risk for illness or death.
• Weigh an average of 200 grams less than infants born to women who do not smoke.
• Are 1.4 to 3.0 times more likely to die of Sudden Infant Death Syndrome (SIDS).

Smoking during the last three months of pregnancy:
• Of women who smoked during the last 3 months of pregnancy, 52% reported smoking 5 or fewer cigarettes per day, 27% reported smoking 6 to 10 cigarettes per day, and 21% reported smoking 11 or more cigarettes per day.
• Of women who smoked 3 months before pregnancy, 45% quit during pregnancy. Among quitters during pregnancy, 52% relapsed within 6 months after delivery.

Prevalence of smoking during pregnancy:
• Approximately 13% of women reported smoking during the last three months of pregnancy.
• Younger, less educated, non-Hispanic, white women and American Indian women are more likely to smoke during pregnancy compared to their older, more educated, counterparts.
• Of women who smoked during the last three months of pregnancy, 52% reported smoking 5 or less cigarettes per day, 27% reported smoking 6 to 10 cigarettes per day, and 21% reported smoking 11 or more cigarettes per day.

Source: Centers for Disease Control & Prevention