Second hand smoke is highly toxic. Here's what happens when pregnant women and their babies are exposed to second hand smoke. Smoking, vaping & pregnancy: in pictures Raising Children Network Vaping During Pregnancy: Are e Cigarettes Safe for Baby? While vaping is not risk free, it is less harmful than tobacco Our World in Data Vaping more effective than patches for pregnant women, study finds Dr Colin Mendelsohn The role of puff volume in vaping emissions, inhalation risks, and metabolic perturbations: a pilot study Scientific Reports