im a serious smoker and my weed means a lot to me, but one thing i am not is ignorant, smoking full stop will harm the baby, nicotine constricts the blood vessels on your side of the placenta meaning it is much more difficult for the foetus to gain oxygen, smoking raises levels of carbon monoxide in blood, restricting oxygen to a baby is dangerous ,i dont know what exactly it would do, but i guess it would restrict the babys growth or may cause other malfuntions YOU HAVE BEEN WARNED if you are desperate use a vaporiser and get your fix of THC from that nicotine is poisonous to a baby so dont smoke