TTT - // ....so they don't care enough about their unborn child to do it anyway? //
That falls into the very simple trap that a large number of intelligent rational people assume - that everyone else is as intelligent and rational as they are.
Clearly they are not.
If you start from the premise that anyone, of any age or gender, who starts smoking, is not in full possession of their faculties - because people who are, do not embark on such a pointless dangerous expensive unattractive habit in the first place - then you can see that thinking ahead and reasoning and making rational decisions are aspects of life that some people simply do not possess.
Nonetheless, as a caring society, there is not a cut-off point for intelligent thinking, beyond which we simple abandon people to the fate of their poor choices.
Instead, we attempt to assist and educate, and that is what this programme is about.