| Value |
Category |
| 1 |
I have never smoked |
| 2 |
I have not stopped smoking |
| 3 |
1-3 months |
| 4 |
4-6 months |
| 5 |
From 7 months to one year |
| 6 |
More than one year |
| Sysmiss |
|
Warning: these figures indicate the number of cases found in the data file. They cannot be interpreted as summary statistics of the population of interest.