Smoking status in adolescents, aged 13–18 yrs, participating in the YOUNG-HUNT study with both self-reported questionnaire and spirometry
| Males | Females | Total | |
| Never tried smoking, not even one cigarette | 1522 (45) | 1471 (43) | 2993 (44) |
| Tried smoking, but reported to be nonsmokers | 929 (27) | 898 (26) | 1827 (27) |
| Previous smokers | 199 (6) | 238 (7) | 437 (6) |
| Occasional smokers | 282 (8) | 383 (11) | 665 (10) |
| Daily smokers | 320 (10) | 357 (11) | 677 (10) |
| Missing data# | 132 (4) | 80 (2) | 212 (3) |
| Total | 3384 (100) | 3427 (100) | 6811 (100) |
Data are presented as n (%)
Adolescents who reported ever having asthma were excluded
#: students who did not answer the questions on smoking