| Value | Category | Cases | |
|---|---|---|---|
| 1 | Smoking | 902481 |
9.2%
|
| 2 | Not smoking | 3437366 |
35%
|
| 3 | Refused to answer | 119237 |
1.2%
|
| 8 | Unknown | 6083 |
0.1%
|
| 9 | Unspecified | 5343457 |
54.5%
|