Table 5.
Association between e-cigarette ever-use and ever/former smoking. Ever smoking was evaluated in the whole sample, while former smoking was evaluated among ever smokers
| Risk factors | Ever smoking | Former smoking | ||
|---|---|---|---|---|
| OR (95% CI) | p-value | OR (95% CI) | p-value | |
| E-cigarette: ever vs never users | 13.45 (9.26–19.55) | < 0.001 | 0.33 (0.20–0.53) | < 0.001 |
| Gender (women vs men) | 0.90 (0.76–1.06) | 0.215 | 0.73 (0.44–1.22) | 0.235 |
| Family history of smoking | ||||
| None | 1 | 1 | ||
| Users of e-cigarettes | 1.32 (0.89–1.95) | 0.162 | 1.05 (0.69–1.60) | 0.820 |
| Users of tobacco cigarettes | 0.93 (0.73–1.19) | 0.562 | 1.20 (0.58–2.50) | 0.617 |
| Housemates currently smoking | ||||
| None | 1 | 1 | ||
| Users of e-cigarettes | 0.99 (0.72–1.37) | 0.975 | 0.87 (0.62–1.21) | 0.416 |
| Users of tobacco cigarettes | 2.55 (1.66–3.91) | < 0.001 | 0.55 (0.26–1.16) | 0.116 |
| Centre | ||||
| Verona | 1 | 1 | ||
| Vicenza | 1.02 (0.99–1.05) | 0.200 | 0.95 (0.86–1.05) | 0.331 |
| Legnago | 1.11 (1.08–1.14) | < 0.001 | 1.44 (1.27–1.63) | < 0.001 |
| Trento | 0.97 (0.91–1.04) | 0.423 | 1.29 (1.03–1.62) | 0.028 |
| Bolzano | 1.41 (1.37–1.45) | < 0.001 | 1.38 (1.20–1.59) | < 0.001 |
| University class | ||||
| 1st year | 1 | 1 | ||
| 2nd year | 1.12 (0.92–1.37) | 0.269 | 2.31 (1.04–5.11) | 0.039 |
| 3rd year | 1.35 (0.97–1.86) | 0.072 | 1.47 (0.76–2.86) | 0.254 |
ORs (95% CI) and p-values were computed by logistic regression models, controlling for centre, gender, family history of smoking habits, smoking habits among current housemates, and university class. Significant results are highlighted in bold