Boston MP Mark Simmonds has supported a ban on smoking in cars when children are passengers.
Mr Simmonds voted with a Labour-supported amendment to the Children and Families Bill which gives the power to secretary of state Jeremy Hunt to introduce a ban in England.
MPs were given a ‘free vote’ for the issue and Mr Simmonds, a junior foreign office minister, chose to use his vote in favour of a ban.
The amendment passed by 376 votes to 107.
Neighbouring MP John Hayes chose to vote against the ban.
Critics have said the law would be difficult to enforce and is not needed but those in favour say it will help the health of children.
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