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Effect of Smoking on Lifespan

1. In a USA study it was found that heavy smokers have lower life expectancies than persons with all other smoking statuses; indeed, compared to never smokers, heavy smokers at age 25 can expect at least a 25% shorter life (17^✔ ✔Trusted Source
   Life expectancies of cigarette smokers and nonsmokers in the United States
   
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2. In a UK study who stopped smoking at age of 60, 50, 40, or 30 years gained, respectively, about 3, 6, 9, or 10 years of life expectancy (18^✔ ✔Trusted Source
   Mortality in relation to smoking: 50 years' observations on male British doctors
   
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3. In a Netherlands study it was found that average cigarette smoking reduced the total life expectancy by 6.8 years, whereas heavy cigarette smoking reduced the total life expectancy by 8.8 years. The number of total life‐years lost due to cigar or pipe smoking was 4.7 years(19^✔ ✔Trusted Source
   Mortality and life expectancy in relation to long-term cigarette, cigar and pipe smoking: the Zutphen Study
   
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4. In the same Netherlands study men who stopped smoking at age 40 gained 4.6 life‐years, compared with men who continued smoking at that age while the gained life‐years were 2.5–3.3 years among men who stopped smoking at age 50, 60 or 70 years(19^✔ ✔Trusted Source
   Mortality and life expectancy in relation to long-term cigarette, cigar and pipe smoking: the Zutphen Study
   
   Go to source).