Just stop with your strawman argument. Exposing an unborn child to nicotine is harmful to the child. This is not a gray area, this is clearly bad for the child.
Based purely on empirical data, one might almost think a little nicotine and alcohol while in the womb makes babies tougher!
Also, keep in mind that when the same government that controls the medical studies also decides what measures must be taken as a result of those studies, there is an inherent conflict of interest.