The success of the smoking ban has had a positive impact on the health of the less well off in society.
A new report which makes the finding, says there are about 1,200 fewer fatalities every year since the introduction of the ban 10 years ago.
This study is the first of its kind as no study had ever examined the influence of socio-economic status indicators on post-smoking ban mortality rates.
Director of the Tobacco Free Research Institute Professor Luke Clancy told RedFM News: "The biggest improvement in mortality is among the less well-off…There's (usually) a tendency for the better off to improve more.
"This is the first study to show the smoke-free law in Ireland has a profound effect on reducing mortality among the least well-off in our society."