Health & Wellbeing

Smoking Pack-Years

Lifetime cigarette exposure measure.

Education and reference only. Not a substitute for clinical judgement, local policy or product labelling. Always verify before clinical use. Values are calculated in your browser and never stored.

When to use

Use to quantify lifetime smoking exposure — often asked about in health checks and used to assess risk.

Why use

One pack-year is smoking 20 cigarettes a day for a year. Pack-years help estimate the risk of smoking-related diseases such as lung disease and cancer.

Advice

The higher the pack-years, the greater the risk — but stopping smoking reduces risk at any age, and the benefits begin within days. Support and stop-smoking aids greatly improve success.

References

Standard pack-year definition (20 cigarettes/day × years).

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