The Heaviness of Smoking Index
| How many cigarettes do you smoke a day? | |
| Score | |
| 10 or fewer | 0 |
| 11–20 | 1 |
| 21–30 | 2 |
| 31 or more | 3 |
| How soon after waking up do you smoke your first cigarette of the day? | |
| Score | |
| 60 minutes | 0 |
| 31–60 minutes | 1 |
| 6–30 minutes | 2 |
| Within 5 minutes | 3 |
| Level of nicotine dependence by total score: | |
| 0–2 = low | |
| 3–4 = moderate | |
| 5–6 = high | |
Based on information in reference 4.