Second hand smoke is highly toxic. Here's what happens when pregnant women and their babies are exposed to second hand smoke. Vape residue may harm unborn babies, mouse study suggests In the United States, about 8% of all women who are pregnant smoke cigarettes, and another roughly 4% report using electronic cigarettes or vapes. To learn more about the dangers of smoking Vaping & Pregnancy Vape Smoke Free Second hand e cigarette vapour increases risk of poor respiratory health, study finds Nursing in Practice E Cigarettes (Vapes) Smoking and Tobacco Use CDC