[Gary L]

The doctors acknowledge that a ban on smoking in the home, however desirable it believes this to be, would be neither politically or practically possible, but sees the car as an intervention in the private sphere which the public would tolerate.
But it argues that the only way to make it practically enforceable would be to introduce it as a blanket ban on all private vehicles - regardless of their passengers, as exemptions would prove too complex.
In addition, it wants to see smoking banned in places frequented by children, such as parks and outdoor swimming pools - and exclusion zones outside school gates.

Oh shut up!

http://news.bbc.co.uk/1/hi/health/8583551.stm