Animal Study Shows Harmful Effects of Secondhand Smoke Even Before Pregnancy Duke Health The Impact of E Cigarettes and Asthma: What You Need to Know Secondhand Smoke Is a Risk for Pregnant and Breastfeeding Moms The Wellness Coalition Symptoms Of Second Hand Vape Smoke Can Second Hand Vape Smoke Affect Pregnancy Second hand smoke 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