Smoking-related characteristics of users of public health centre-based Smoking Cessation Clinics and smokers in the general population in Korea, 2009
| Characteristic | Clinic users (N=354 554) | Smokers in the general population* (N=1661) |
| Proportion of females (%) | 10.3 | 15.8 |
| Mean age of users (years) | 44.1 | 45.4 |
| Mean age at smoking start (years) | 20.3 | 19.9 |
| Average number of cigarettes per day | 20.0 | 15.5 |
| Mean duration of smoking (years) | 24.4 | 16.8 |
| Past quit attempts (%) | 76.5 | 57.2 |
↵* Korea Health Statistics 2009: Korea National Health and Nutrition Examination Survey (KNHANES IV-3).3