Labour will attempt to impose a ban on smoking in cars that are carrying children in England later today.
Labour peers will table an amendment to the Children and Families Bill going through the Lords.
If passed, it will give police the power to issue any driver caught smoking with a child in the vehicle with a £60 fine.
However, ministers say education campaigns are a more effective way to discourage people than a £60 fine.
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She told reporters: "I don't think it's fully sunk in how really bad that could have been, I know it's not the right decision."
Jonathan Theobald said: "The weather can change quickly and a car can become lethal, I've discovered that the hard way."
Political parties across the country suspended their General Election campaigns following the Manchester Arena terror attack on Monday.