It shouldn't but it doesn't matter whether it is drugs he is smoking or normal cigarettes - both are dangerous. Second hand smoke does just as much damage to you and your unborn baby as smoking yourself so make sure you're not around him or anyone else smoking anything. Probably a good idea he tried and stops though since he's going to be a dad.
Shouldn't affect the baby if its in his system. Doesn't matter now anyway, what's done is done and there's nothing you can do about it now apart from keeping you and your unborn child away from any smoke.
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