Smoking in cars that are carrying children has already been banned in some states of Canada, Australia and the US and the whole of South Africa.
Canada's Cancer Advisory Coalition claims the states' bans on smoking in cars have reduced children's exposure to second-hand smoke by 33%.
More top news
A cloudy start in the east with the odd spot of drizzle, but brightening up here through the morning.
Charlie Gard's parents are spending their "last precious moments" with the terminally ill boy after a legal fight over his treatment ended.
Leaseholds on new-build houses could be banned outright under proposals to stamp out abuses of the system.