I honestly don't understand the logic behind 'your body, your baby'.
The fact is that in a civilised country, we have laws to protect the vulnerable and law abiding from members of society who would inflict harm.
We outlaw murder, rape, child abuse AND PASSIVE SMOKING.
We have the seat belt law in cars. I am old enough to remember the days before seat belts existed, before seat belt law was in place, when the argument was on 'personal freedom' and liberty to do what you wanted.
But flying through the windscreen and being splattered on the road is not exactly of benefit to society- it costs money to clear it up, patch up people .
How is inflicting harm on an unborn child any different? Parents can't smoke in cars if they carry children, so why should mothers force their unborn baby to be affected by fags?
I don't know how it could be policed, but that's not the same as shrugging and saying ' Their body, their baby' as if it's something society should accept.