Smoking life expectancy calculator
The shape of your forecast: how much of your life expectancy comes back after quitting, and how quickly, depending on the age you quit.
Nothing you type leaves this page. The math happens on your own device, and none of it is stored or sent anywhere. See the privacy page for what the site records. The answer is an estimate built from population averages and gives no medical advice: the limits are below, and the full math is on the methodology page.
The quit smoking calculator gives one answer. This one shows how that answer moves across the years after you quit, and what the age you quit at does to how much comes back. For the money side, use the cost of smoking calculator.
Your numbers
Your estimate
Average life expectancy for a 40-year-old man: about 78.59 years. The forecast below never passes this number.
| Time since quitting | Forecast |
|---|---|
| Quit day | 75.05 years |
| 1 year smoke-free | 75.69 years |
| 5 years smoke-free | 77.19 years |
| 10 years smoke-free | 77.87 years |
| Eventual ceiling (smoke-free for good) | 78.18 years |
At age 40, quitting recovers about 88.5% of the 3.54 years smoking has likely cost so far, about 3.13 years back over time.
Why quitting earlier returns more
The share of smoking's cost that quitting can recover falls the later someone quits, because Jha et al. found less excess risk is reversible the longer someone has already smoked. The calculator above already applies this to your entered age. These are the same published bands at a few reference ages, so the pattern is visible without changing the form:
| Age at quitting | Recoverable share |
|---|---|
| 30 | about 99.5% |
| 40 | about 88.5% |
| 50 | about 59.0% |
| 60 | about 39.0% |
| 70 and above | about 20.0% (floor) |
What this cannot tell you
- The baseline is not a never-smoker figure. The life table describes the whole general population, smokers included, so it is a slight underestimate of what quitting is really worth.
- Anything past age 64 is extrapolation. Jha et al.'s published recovery bands stop at 64. Past that, the same slope continues and is floored, which is a reasonable estimate for the part of the curve nobody has measured.
The figure above is a motivational estimate built from population averages. It is not a prediction about you, it does not diagnose, treat or prevent any condition, and it is not medical advice. No guarantee is made or offered about the accuracy of any figure or calculation on this site. Talk to a doctor or a quitline about stopping smoking. In the US, that is 1-800-QUIT-NOW.
Frequently asked
How is this different from the quit smoking calculator?
The quit smoking calculator gives one answer, for the numbers you enter. This page takes the same numbers and shows how the answer changes over time: at quit day, one year, five years, ten years, and where it stops rising. How quickly life expectancy comes back is a different question from what it is right now.
Why does the recovered figure grow quickly at first and then slow down?
The model returns recoverable time on a curve that is front loaded: about half of what is recoverable comes back within roughly three years of staying smoke-free, and about ninety percent by ten years. That shape is anchored to real cessation milestones such as coronary risk roughly halving within a year and approaching a never-smoker's by about fifteen years, though the single curve used to connect those milestones is a modeling choice.
Does quitting at 50 or 60 still help?
Yes, though less of the time comes back the later someone quits. Jha et al.'s bands put the recoverable share at about ninety nine percent quitting at 30, fifty nine percent at 50 and thirty nine percent at 60, falling to a floor of twenty percent from about age seventy. Quitting later still recovers real time, just a smaller share of it.
Is this a medical prediction?
No. Every figure here is a motivational estimate built from population averages. For medical advice, talk to a doctor. It does not diagnose, treat or prevent any condition. A doctor or quitline can advise on stopping smoking itself, in the US, that is 1-800-QUIT-NOW.
Where do the numbers go once I type them?
Nowhere. The math happens on your own device. Nothing you type is transmitted, logged or stored anywhere, including by us.
Sources
- US Social Security Administration, 2023 period life table, Social Security area population.
- Jackson, S. E., Jarvis, M. J. and West, R., "The price of a cigarette: 20 minutes of life?", Addiction, 2025 (doi 10.1111/add.16757).
- Jha, P. et al., "21st-Century Hazards of Smoking and Benefits of Cessation in the United States", New England Journal of Medicine, 2013.
For the full math behind these numbers, including the front-loaded recovery curve, see how the estimate is calculated.