Table 3.
Cross-sectional associations at 12-month follow-up between use of e-cigarettes among past-year smokers and quit attempts, successful cessation among those who made a quit attempt, and overall quits, adjusting for covariates measured at baseline.
| Prevalence, % (n) |
OR [95% CI] p |
ORadj [95% CI]1p |
||||||
|---|---|---|---|---|---|---|---|---|
| Neither e-cigarettes nor NRT (1) | Use of NRT (2) | Use of e-cigarettes (3) | (3) vs. (1) | (3) vs. (2) | (3) vs. (1) | (3) vs. (2) | ||
| Dual use for any reason, n | 916 | 29 | 140 | |||||
| Past-year quit attempts | 29.9 (2 7 4) | 72.4 (21) | 57.1 (80) | 3.12 [2.17–4.49]<0.001* | 0.51 [0.21–1.23] 0.132 | 2.83 [1.92–4.17]<0.001* | 0.43 [0.17–1.08] 0.073 | |
| Quit success2 | 33.5 (91) | 40.0 (8) | 39.7 (31) | 1.31 [0.78–2.20] 0.305 | 0.99 [0.36–2.70] 0.983 | 1.43 [0.82–2.49] 0.214 | 0.85 [0.29–2.52] 0.768 | |
| Overall quits | 11.0 (1 0 1) | 31.0 (9) | 25.0 (35) | 2.69 [1.74–4.16]<0.001* | 0.74 [0.31–1.78] 0.501 | 2.82 [1.78–4.48]<0.001* | 0.73 [0.29–1.84] 0.509 | |
1Adjusted for age, sex, ethnicity, social grade, number of cigarettes smoked per day, strength of urges to smoke, motivation to stop smoking, and past-year quit attempts at baseline, and year and quarter of survey. Models relating to the success of quit attempts also controlled for time since the quit attempt began and whether the quit attempt was abrupt or gradual, measured at 12-month follow-up.
2Among those who reported at least one quit attempt in the past 12 months.
*p < 0.05.