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 What is Vaping? Vaping Dangers Ashley Addiction Treatment In secondhand vape, scientists smell risk American Heart Association Vaping during pregnancy Tommy's Secondhand e cigarette aerosols expose kids to less nicotine than cigarettes, study finds, but can still be risky CNN Animal Study Shows Harmful Effects of Secondhand Smoke Even Before Pregnancy Duke Health