| Value | Category | Cases | |
|---|---|---|---|
| 1 | I never smoked e-cigarette | 4124 |
86.9%
|
| 2 | 7 years or earlier | 130 |
2.7%
|
| 3 | 8 or 9 years | 57 |
1.2%
|
| 4 | 10 or 11 years | 109 |
2.3%
|
| 5 | 12 or 13 years | 236 |
5%
|
| 6 | 14 or 15 years | 87 |
1.8%
|
| 7 | 16 years or later | 3 |
0.1%
|
| Sysmiss | 55 |