Pregnancy & Tobacco Make an Appointment Ask a Question Find a Doctor Smoking can make it more difficult to get pregnant, cause complications during pregnancy and pose serious health risks for the baby after it is born. Cigarette smoking during pregnancy is associated with the following health problems: pregnancy complications preterm delivery low birth weight infants stillbirth sudden infant death syndrome (SIDS). Babies whose mothers smoke while pregnant have weaker lungs than other babies. Nicotine may cause constrictions in blood vessels to the umbilical cord and uterus, which decreases the amount of oxygen available to the fetus. Only about 30 percent of women who smoke stop smoking when they find out they are pregnant. References The health consequences of smoking – 50 years of progress: a report of the Surgeon General. – Atlanta, GA. : U.S. Department of Health and Human Services, Centers for Disease Control and Prevention, National Center for Chronic Disease Prevention and Health Promotion, Office on Smoking and Health, 2014. This information has been approved by Amy Lukowski, PsyD (August 2015).