Just how bad is smoking during pregnancy? To banish any doubts about the severe harm caused by smoking to babies and pregnant women, a comprehensive systematic review of all studies over the past 50 years has been undertaken. The conclusion? Maternal smoking causes a range of serious birth defects including heart defects, missing/deformed limbs, clubfoot, gastrointestinal disorders, and facial disorders.
The new study, “Maternal smoking in pregnancy and birth defects: a systematic review based on 173,687 malformed cases and 11.7 million controls,” undertaken by a team led by Allan Hackshaw, Cancer Research UK & UCL Cancer Trials Centre, University College London, will be published online today in Human Reproduction Update from the European Society of Human Reproduction and Embryology.
Smoking during pregnancy is also a risk factor for premature birth, says Dr. Michael Katz, senior Vice President for Research and Global Programs of the March of Dimes. The March of Dimes urges all women planning a pregnancy or who are pregnant to quit smoking now to reduce their chance of having a baby born prematurely or with a serious birth defect. Babies who survive being born prematurely and at low birthweight are at risk of other serious health problems, Dr. Katz notes, including lifelong disabilities such as cerebral palsy, intellectual disabilities and learning problems. Smoking also can make it harder to get pregnant, and increases the risk of stillbirth.
Unborn babies are exposed to dangerous chemicals like nicotine, carbon monoxide and tar from maternal smoking, depriving the baby of oxygen needed for healthy growth and development.
According to the press release for the study, smoking during pregnancy can also cause problems for a woman’s own health, including: ectopic pregnancy; vaginal bleeding; placental abruption, in which the placenta peels away, partially or almost completely, from the uterine wall before delivery; placenta previa, a low-lying placenta that covers part or all of the opening of the uterus.
Smoking is also known to cause cancer, heart disease, stroke, gum disease and eye diseases that can lead to blindness.