Welsh Government ministers will have the power to ban smoking in cars carrying children after a vote at Westminster.
The move's been welcomed by doctors' leaders but opponents say it would be difficult to enforce.
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The Welsh Government will later launch new plans to reduce the number of children living in poverty in Wales.
Plaid Cymru are to launch their campaign this morning ahead of May's general election.
A study by Swansea University has found a fifth of students in the UK have considered working in the sex industry to fund their studies.