| Persistent current smokers | Persistent former smokers | Quitting smokers | Current ex-former smokers# | |
| RB-like pattern | 34 (77.3) | 6 (13.6) | 4 (9.1) | 0 |
| Stable | 31 | 6 | 1 | |
| Increased | 3 | 0 | 0 | |
| Decreased | 0 | 0 | 3 | |
| OCIP-like pattern | 7(58.3) | 2 (16.7) | 3 (25.0) | 0 |
| Stable | 4 | 2 | 3 | |
| Increased | 3 | 0 | 0 | |
| Decreased | 0 | 0 | 0 | |
| Indeterminate pattern | 7(53.9) | 2 (15.4) | 4 (30.8) | 0 |
| Stable | 6 | 2 | 1 | |
| Increased | 1 | 0 | 0 | |
| Decreased | 0 | 0 | 3 | |
| Normal | 123 (62.1) | 52 (26.3) | 21 (10.6) | 2 (1.0) |
| Stable | 123 | 50 | 21 | 2 |
| Increased | 0 | 2 | 0 | 0 |
Data are presented as n (%) or n. RB: respiratory bronchiolitis; OCIP: other chronic interstitial pneumonia. #: ex-smokers who resumed smoking between baseline and repeat computed tomography examinations.