Smoking, vaping & pregnancy: in pictures Raising Children Network Smoking and vaping during pregnancy increase the risk of preterm birth support is available to help you quit. Smoking during pregnancy is the biggest modifiable risk factor for preterm birth. Quitting Vaping is a Better Safer Alternative for Pregnant Smokers Ecigator Jones co founder Hilary Dubin explains the risks that come with vaping and smoking during pregnancy. Study finds vaping in pregnancy harms both mothers and babies