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KAMURAROOTED IN WELLNESS
Health tools / Lifestyle

Smoking pack-years

The number clinicians use to quantify lifetime smoking exposure.

Published formula · ~1 min · Reviewed October 2026 · Scored on your device

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WHAT THIS DOES NOT DO
  • Pack-years measures exposure, not risk. Age, how long ago you stopped and other factors all matter.
  • Screening eligibility differs between countries and guidelines; this number is one input, not a decision.
  • It does not account for shisha, vaping or secondhand smoke.
SOURCE & LICENCE

National Cancer Institute. NCI Dictionary of Cancer Terms: pack year. US National Institutes of Health.

Pack-years is a standard arithmetic definition in widespread clinical use. No licence applies.

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