Vape Residue May Harm Unborn Babies' Immune Systems Respiratory Therapy Does Vaping Cause Secondhand Smoke? Second hand vaping exposure very low compared to second hand smoking UCL News UCL University College London Vaping before, during and after pregnancy: leaflets and infographics ASH 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