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 Vape residue may harm unborn babies, mouse study suggests Vaping & Pregnancy Vape Smoke Free Second hand smoke is highly toxic. Here's what happens when pregnant women and their babies are exposed to second hand smoke. Parents using e cigs expose kids to dangerous secondhand vapor Futurity