Demographic and smoking characteristics of the study sample
| Characteristic | n (%) |
| Age (mean(SD)) | 40.5 (14.4) |
| Ethnicity | |
| Han | 3401 (91.6) |
| Others | 293 (7.9) |
| Missing data | 16 (0.4) |
| Education level | |
| Junior school or lower | 1100 (29.6) |
| High school/technical school | 1012 (27.3) |
| College, university or higher | 1594 (43.0) |
| Missing data | 4 (0.1) |
| Family monthly income per capita | |
| <2000¥* | 703 (18.9) |
| 2000–3999¥ | 1736 (46.8) |
| 4000–5999¥ | 857 (23.1) |
| >6000¥ | 408 (11.0) |
| Missing data | 6 (0.2) |
| Marital status | |
| Married | 2702 (72.8) |
| Not married | 996 (26.8) |
| Missing data | 12 (0.3) |
| Occupation | |
| Professionals | 842 (22.7) |
| Officers and clerks in government, institutions and corporations | 554 (14.9) |
| Business or service employees | 614 (16.5) |
| Farmers and manual workers | 1085 (29.2) |
| Students | 179 (4.8) |
| Retirees | 433 (11.7) |
| Missing data | 3 (0.1) |
| City | |
| Shanghai | 1338 (36.1) |
| Nanning | 1174 (31.6) |
| Mudanjiang | 1198 (32.3) |
| History of quit attempt | |
| Yes | 1925 (51.9) |
| No | 1781 (48.0) |
| Missing data | 4 (0.1) |
| Mean (SD) | |
| Smoking rationalisation beliefs (missing data of 52 participants) | 3.3 (0.5) |
| Knowledge of smoking-related diseases (missing data of 11 participants) | 1.6 (1.1) |
| Nicotine dependence (missing data of 29 participants) | 2.9 (2.1) |
| Intention to quit in 6 months | |
| Yes | 2966 (79.9) |
| No | 744 (20.1) |
*1$=6.19¥ (2013).