A pregnant woman smokes a vape while sitting on the couch. Close up of the abdomen Stock Photo Alamy Pregnant Vapers More Likely to Have Low birthweight Infants Respiratory Therapy 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 And Pregnancy TECC Blog Woman's Doctor: Is vaping during pregnancy dangerous? E Cigarette Use During Pregnancy & Breastfeeding FAQs HealthyChildren.org