Stages of change for smoking cessation (Prochaska–DiClemente model [55])
| Precontemplation | Active smokers not interested in quitting in the next 6 months |
| Contemplation | Active smokers considering quitting sometime in the next 6 months |
| Preparation | Active smokers planning on quitting in the next 30 days |
| Action | Quit smoking within the last 6 months |
| Maintenance | Quit smoking more than 6 months ago |