Vape residue may harm unborn babies, mouse study suggests 2nd Hand Vape Smoke And Pregnancy The risks of secondhand smoke 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 Thirdhand Smoke Resource Center Protecting Californians Vaping before, during and after pregnancy: leaflets and infographics ASH Tobacco smoking and vaping in pregnancy and neonatal outcomes: results from a UK cohort study