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| Tobacco smoke free (in former smokers; months) | Cigarette packs/day | Cigarette packs/year | Smoke duration (years) | |
|---|---|---|---|---|
| Median | 180 | 1 | 24 | 35 |
| Minimum | 2 | 1/20 | 1.5 | 3 |
| Maximum | 600 | 3 | 120 | 70 |
