Second Hand Vaping Vape Smoke Free Secondhand Vape Exposure: Effects, Who's at Risk, and More 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 Use of Electronic Vapor Products Before, During, and After Pregnancy Among Women with a Recent Live Birth Oklahoma and Texas, 2015 MMWR