Animal Study Shows Harmful Effects of Secondhand Smoke Even Before Pregnancy Duke Health The risks of secondhand smoke Tommy's Is Vape Smoke Bad For Second Hand Evidence Mounts About the Health Impact of Second Hand Vaping Vape Residue May Harm Unborn Babies' Immune Systems Respiratory Therapy 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