Association of Maternal Cigarette Smoking and Smoking Cessation With Preterm Birth

Cigarette smoking during pregnancy increases the risk of preterm birth, low birth weight, and infant mortality.To assess the probability of preterm birth among expectant mothers who smoked cigarettes before pregnancy and quit smoking at the start or during pregnancy.This cross-sectional study analyzed information provided on live birth certificates from 2011 through 2017 that were obtained from US states that implemented the 2003 revision of the...