Any form of smoking is not allowed during pregnancy, and this includes electronic cigarettes, which can cause harm to both the mother and the baby. It can affect the baby's growth and Vaping While Pregnant Report Gives Advice For Midwives Is It Safe To Use E Cigarettes In Pregnancy Emma's Diary Note the SWITCHEROO tactic. First they lie by saying it's a "myth" that e cigarettes are LESS HARMFUL THAN SMOKING during pregnancy (recent studies found #vaping IS less harmful than smoking during pregnancy.)