Health care costs for smokers at a given age are as much as 40 percent higher than those for nonsmokers, but in a population in which no one smoked the costs would be 7 percent higher among men and 4 percent higher among women than the costs in the current mixed population of smokers and nonsmokers. If all smokers quit, health care costs would be lower at first, but after 15 years they would become higher than at present. In the long term, complete smoking cessation would produce a net increase in health care costs, but it could still be seen as economically favorable under reasonable assumptions of discount rate and evaluation period.
When it comes to short-term effects, Cancer.org claims that:
From 2000 to 2012, tobacco-related health costs and productivity loss in the United States totaled $289 Billion
The average price of a pack of cigarettes in the United States is \$6.36. But each pack of cigarettes creates $35 dollars of health-related costs for the smoker.
However no information is given on long-term effects.
The question is therefore: if everyone stopped smoking, would healthcare systems around the world see a net increase or decrease in expenses in the long term?