The chair of the Royal College of Physicians' tobacco advisory group, John Britton, says the RCP is calling on MPs to support "this important health amendment".
The evidence shows the importance of protecting children from passive smoking, and cars are still a major area of exposure.
Such exposure is widely associated with adverse health effects, including an increased risk of respiratory and allergic symptoms. That is why the RCP is calling on MPs to support this important public health amendment.
But pro-smoking groups have said the restriction would be an "unnecessary intrusion into people's private lives.
More top news
ITV News Correspondent Lucy Watson is visiting North Korea and offers a glimpse of what ordinary life is like inside the secretive state.
The NHS has reportedly racked up a deficit of almost £1bn in the first three months of the financial year.
Jurgen Klopp has branded himself 'The Normal One' in his first press conference as the new Liverpool manager