Health minister Norman Lamb, who revealed he quit smoking last week, said the cost of the campaign was about "a couple of million" pounds.
He told BBC Breakfast:
It costs the NHS over £2.7 billion a year, over 1,200 people admitted to hospital every day as a result of smoking, so this is an enormous killer.
With the number of lives that are lost, and the number of families that are destroyed as a result of that, surely to commit a bit of resource to a campaign that could result in saving lives is worthwhile.
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Nearly 38,000 runners will hope to complete Sunday's London Marathon making it the biggest event in its 35-year history.
Rain across central Britain with longer, intense downpours with thunder in places this evening. A lucky few will stay sunny and dry.
Planning on going to the London Marathon tomorrow? Read our handy guide first!