Uncover your nicotine dependence level with our free HSI Calculator. The Heaviness of Smoking Index (HSI) is a concise, two-item measure derived from the Fagerström Test for Nicotine Dependence (FTND), providing a quick assessment of your smoking habit's severity. Understand your risk and take the first step towards a healthier future.
Formula:
The Heaviness of Smoking Index (HSI) is calculated by summing points from two key factors:
- Cigarettes Per Day (CPD) Score: Based on how many cigarettes you smoke daily.
- Time To First Cigarette (TTFC) Score: Based on how soon after waking you smoke your first cigarette.
HSI Score = CPD Score + TTFC Score
Scores for each variable are as follows:
Cigarettes Per Day (CPD) Scoring:
- 0-10 cigarettes: 0 points
- 11-20 cigarettes: 1 point
- 21-30 cigarettes: 2 points
- 31+ cigarettes: 3 points
Time To First Cigarette (TTFC) Scoring:
- >60 minutes: 0 points
- 31-60 minutes: 1 point
- 6-30 minutes: 2 points
- <=5 minutes: 3 points