Bans on smoking in public places have had a bigger impact on preventing heart attacks than ever expected, data shows.
Smoking bans cut the number of heart attacks in Europe and North America by up to a third, two studies report.
This "heart gain" is far greater than both originally anticipated and the 10% figure recently quoted by England's Department of Health.
The studies appear in two leading journals - Circulation and the Journal of the American College of Cardiology.
Heart attacks in the UK alone affect an estimated 275,000 people and kill 146,000 each year.
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