Pack-years of smoking
Cumulative tobacco exposure, used for lung cancer screening eligibility.
Inputs
0 of 2years
When to use
- Lung cancer screening eligibility and smoking history.
Pearls and pitfalls
- USPSTF 2021: annual low-dose CT for ages 50–80 with 20 or more pack-years who smoke now or quit within 15 years.
Why use
One number for screening decisions.
Pack-years = packs per day × years smoked