| Smoke Exposure | Total | ||||
| No | Yes | ||||
| Stage | I | Count | 194 | 63 | 257 |
| % within Smoke Exposure | 23.4% | 23.7% | 23.5% | ||
| II | Count | 285 | 87 | 372 | |
| % within Smoke Exposure | 34.4% | 32.7% | 34.0% | ||
| III | Count | 269 | 86 | 355 | |
| % within Smoke Exposure | 32.5% | 32.3% | 32.4% | ||
| IV | Count | 80 | 30 | 110 | |
| % within Smoke Exposure | 9.7% | 11.3% | 10.1% | ||
| Total | Count | 828 | 266 | 1094 | |
| % within Smoke Exposure | 100.0% | 100.0% | 100.0% | ||