Not a supporter. Generally I look down on the sorts of scumbag trashy bitches who smoke or drink when they're pregnant, but I wouldn't want the state to get involved in the minutiae of our personal lives any more than it does already. Up until recently, it wouldn't have been an issue, since the medical costs were borne by individuals, but I think that with increasing involvement of the government in our medical service industry, we will probably see more of this. One day they'll be telling us what we can and can't eat. Joy.
This isn't about smoke or drink, but drug addicts who don't have the capacity to stop using while they are pregnant. And their drugs costs are obviously not financed by the government.