Smoking during pregnancy March of Dimes Study uncovers shift from cigarettes to vapes among pregnant teens with mixed impact on newborns' health Vaping more effective than patches for pregnant women, study finds Dr Colin Mendelsohn Light smoking' before pregnancy can cause major health problems England paying pregnant smokers to switch to e cigs while evidence of damage to developing fetuses grows Stanton Glantz blog Is Vaping Better Than Smoking? American Heart Association