Smoking during pregnancy is associated with pregnancy complications, such as pre-eclampsia, placenta praevia, and placental abruption, and with poor fetal outcomes such as low birthweight, premature birth, stillbirth, sudden infant death syndrome, and high overall perinatal mortality.(1, 2) 1. Systematic review and meta-analysis of miscarriage and maternal exposure to tobacco smoke during pregnancy. Am J Epidemiol. 2014; 179: 807-823 2. Tobacco and pregnancy.Reprod Toxicol. 2009; 28: 152-160 戒菸!