| 16 weeks | 1 Year | |||
| Patients | ||||
| Patient only smoked | 71.1% (69/97) | 73.6% (53/72) | ||
| Both smoked | 55.8% (29/52) | 57.6% (19/33) | ||
| Partners | ||||
| Partner only smoked | 19.5% (8/41) | 27.8% (10/36) | ||
| Both smoked | 23.5% (8/34) | 39.4% (13/33) | ||
| Patients/partners | ||||
| Only one smoker | 55.8% (77/138) | 60.1% (63/108) | ||
| Both smoked | 43.0% (37/86) | 48.2% (32/66) | ||