Pack-years calculator

Pack-years measure cumulative smoking: cigarettes/day × years ÷ 20. The ≥20 threshold means high lung cancer and COPD risk

Cigarettes per day

Years of smoking

Pack price, UAH (optional)

Pack-years

Assessment

<10 — moderate history

Spent on cigarettes: 312 075 UAH
per year: 26 006 UAH

Pack-years = (cigarettes/day ÷ 20) × years. ≥20 pack-years is the main criterion for low-dose CT lung screening. Quitting lowers risk but the history stays.

What happens after quitting

20 min — blood pressure and pulse normalize
24 h — CO cleared from blood
2–12 wk — circulation and lung function improve
1 year — CHD risk halved
10 years — lung cancer risk ~halved
15 years — CHD risk ≈ never-smoker