From: Smoking, cessation and expenditure in low income Chinese: cross sectional survey
 |  | Urban n = 843 | Rural n = 749 | Migrant n = 2198 |
---|---|---|---|---|
Current smoking by age | ≤20 | 43 | 25 | 35 |
 | 21–30 | 64 | 60 | 50 |
 | 31–39 | 73 | 67 | 53 |
 | ≥40 | 65 | 64 | 59 |
Moderate/heavy smoking by age | ≤20 | 15 | 15 | 5 |
 | 21–30 | 16 | 35 | 12 |
 | 31–39 | 37 | 54 | 25 |
 | ≥40 | 30 | 55 | 29 |
Current smoking by major occupation | Agriculture | Â | 74 | Â |
 | Factory | 53 |  | 48 |
 | Construction | 74 |  | 68 |
 | Service | 47 |  | 43 |
Moderate/heavy smoking by major occupation | Agriculture | Â | 31 | Â |
 | Factory | 17 |  | 11 |
 | Construction | 39 |  | 36 |
 | Service | 15 |  | 9 |