Smoking ban in cars.

It seems the Welsh "arse-sembly" government is planning to ban smoking in private cars.
While I'm not a smoker I do have issues with this decision. First off is it only in Wales? surly that's discrimination on grounds of race? it should be nation wide on nothing! Secondly how the hell are they going to police it?. The over stretched police are struggling to cope now, the ban on mobile phones while driving hasn't really been a success, every day you'll see hundreds of people ignoring it, the same with smoking, if the people don't agree they will simply ignore it.
Yet again it's our sad pathetic nanny state trying to look like it's doing something useful to justify it's existence.