Cigarettes have some harmful effects on baby and should be avoided. This is easier said than done. If you do smoke and want help to stop, be sure to talk to your doctor about it. Nicotine replacement products are safe in pregnancy when used under doctor supervision.
E-Cigarettes have not been studied in pregnancy. If you current use one or are thinking about starting, please talk to your doctor first and be sure you know what is going into the vapourizer.