Is the use of electronic cigarettes while smoking associated with smoking cessation attempts, cessation and reduced cigarette consumption? A survey with a 1-year follow-up

Aims To use a unique longitudinal data set to assess the association between e‐cigarette use while smoking with smoking cessation attempts, cessation and substantial reduction, taking into account frequency of use and key potential confounders. Design Web‐based survey, baseline November/December 2012, 1‐year follow‐up in December 2013. Setting Great Britain. Participants National general population sample of 4064 adult smokers, with 1759 (43%) followed‐up. Measurements Main outcome measures were cessation attempt, cessation and substantial reduction (≥50% from baseline to follow‐up) of cigarettes per day (CPD). In logistic regression models, cessation attempt in the last year (analysis n = 1473) and smoking status (n = 1656) at follow‐up were regressed on to baseline e‐cigarette use (none, non‐daily, daily) while adjusting for baseline socio‐demographics, dependence and nicotine replacement (NRT) use. Substantial reduction (n = 1042) was regressed on to follow‐up e‐cigarette use while adjusting for baseline socio‐demographics and dependence and follow‐up NRT use. Findings Compared with non‐use, daily e‐cigarette use at baseline was associated with increased cessation attempts [odds ratio (OR) = 2.11, 95% confidence interval (CI) = 1.24–3.58, P = 0.006], but not with cessation at follow‐up (OR = 0.62, 95% CI = 0.28–1.37, P = 0.24). Non‐daily use was not associated with cessation attempts or cessation. Daily e‐cigarette use at follow‐up was associated with increased odds of substantial reduction (OR = 2.49, 95% CI = 1.14–5.45, P = 0.02), non‐daily use was not. Conclusions Daily use of e‐cigarettes while smoking appears to be associated with subsequent increases in rates of attempting to stop smoking and reducing smoking, but not with smoking cessation. Non‐daily use of e‐cigarettes while smoking does not appear to be associated with cessation attempts, cessation or reduced smoking.