Animal Study Shows Harmful Effects of Secondhand Smoke Even Before Pregnancy Duke Health Smoking during your partner's pregnancy Raising Children Network 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 Vaping in pregnancy Essential Parent Is Secondhand Vape Smoke Bad for You? The Truth on the Trend Molekule Vape Residue May Harm Unborn Babies' Immune Systems Respiratory Therapy