Second hand smoke is highly toxic. Here's what happens when pregnant women and their babies are exposed to second hand smoke. Vaping in pregnancy Essential Parent A new study from The Ohio State University found that vaping during pregnancy, even without nicotine, can change a baby's skull and face shape. Researchers exposed pregnant mice to common vape liquids Is vaping safer than smoking when you're pregnant? Experts weigh in BabyCenter Smoking and Pregnancy: The Risks of Vaping Characteristics of second hand exposure to aerosols from e cigarettes: A literature review since 2010 ScienceDirect