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 Second Hand Vape Smoke Pregnancy The Effects of Smoking While Pregnant AND Resources to Quit Busting the Myths About Smoking and Vaping During Pregnancy Second hand vaping exposure very low compared to second hand smoking UCL News UCL University College London