Smoking is almost over in this country. How much has our life expectancy gone up?

Question

Cigarette smoking has been blamed for every thing but flat feet. How effective has most people quitting been.

Answer 1

Not smoking really helps.  However, we eat too much junk food and got obese because of it.  As a result, our life expectancy probably remain the same.  

Answer 2

Well, the death rates for the three biggest killers of smokers (heart disease, cancer and strokes) will be more or less unchanged, seeing as how the three biggest killers of non-smokers are heart disease, cancer and strokes.