"Smoking doubles the risk of abnormal bleeding during pregnancy and delivery. This is dangerous for the pregnant person and baby. Other complications include the premature rupture of membranes, placenta previa, placental abruption, and ectopic pregnancy. Stillbirth." https://www.cdc.gov/tobacco/about/cigarettes-and-reproductive-health.html#:~:text=Smoking%20and%20pregnancy&text=Smoking%20doubles%20the%20risk%20of,Stillbirth