Health Effects of Maternal Exposure to Thirdhand Chemical Residue from Vape Aerosols Persist Long After Infancy Thirdhand Smoke Resource Center Women who vape are more likely to have low birthweight babies, study shows UCLA 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 Is vaping safer than smoking when you're pregnant? Experts weigh in BabyCenter