When a woman smokes cigarettes during pregnancy, her fetus is exposed to many harmful chemicals. Reference: https: www.acog.org womens health faqs tobacco alcohol drugs and pregnancy Study uncovers shift from cigarettes to vapes among pregnant teens with mixed impact on newborns' health Can You Vape While Pregnant? Evidence Based Guide Many smokers switch to vaping while pregnant, but safety issues remain 4 myths about vaping and pregnancy busted Your Pregnancy Matters UT Southwestern Medical Center E Cigarettes and Pregnancy Maternal Infant Health CDC