| Value |
Category |
| 1 |
I have never smoked |
| 2 |
I have not stopped smoking |
| 3 |
1-3 mos |
| 4 |
4-11 mos |
| 5 |
One year |
| 6 |
2 years |
| 7 |
3 years or longer |
| 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.
