4 myths about vaping and pregnancy busted Your Pregnancy Matters UT Southwestern Medical Center Health Problems Caused by Secondhand Smoke Smoking and Tobacco Use CDC 2nd Hand Vape Smoke And Pregnancy 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 Tobacco and secondhand smoke: Effects on pregnancy Animal Study Shows Harmful Effects of Secondhand Smoke Even Before Pregnancy Duke Health