Nicotine products in any form, whether from cigarettes, vaping or chewing tobacco, pass into a mother's bloodstream and through the placenta to the growing baby. Quitting nicotine is hard for many people, Smoking during your partner's pregnancy Raising Children Network Vaping more effective than patches for pregnant women, study finds Dr Colin Mendelsohn Vaping, Teens & Pregnancy Boston Children's Hospital Smoking, vaping & pregnancy: in pictures Raising Children Network