Alberta Health says heart attack related visits to emergency departments fell dramatically in Calgary in the year following the city’s smoking ban. On Jan. 1, 2007, a city by-law made all public spaces smoke-free. A province-wide ban followed the next year. According to the province, 154.8 per 100,000 emergency department visits were due to heart attack in 2006. The next year, there were 79 per 100,000, a decline of 49 per cent.