Should smoking be banned in cars?
The Royal College of Physicians wants England's upcoming review of anti-smoking laws to consider such measures to protect the young.
It says passive smoking results in 300,000 extra child visits to GPs in the UK every year for problems such as asthma and bacterial meningitis.
But driving and smoking lobby groups say cars are a "private space". The RCP is urging a blanket ban regardless of whether children or any other passengers are inside the vehicle.
Do you support a ban on smoking in all vehicles? Are you a smoker? Do you think these proposals are too extreme? Should children be shielded from the sight of adults smoking?