Results Current daily e-cigarette use was reported by 2.4% (1.8%–3.1%) of current and 3.3% (2.5%–4.2%) of former smokers (p=0.002), while former daily use was reported by 5.6% (4.7%–6.8%) and 1.9% (1.3%–2.7%), respectively (p<0.001). More than half of all former smokers had quit for >10 years. Current daily e-cigarette use was rare among former smokers of >10 years (0.2%, 0.1%–0.6%) and was more prevalent in former smokers of ≤2 and 3–5 years (12.9%, 9.1%–17.9% and 9.0%, 5.8%–13.7%, respectively). Compared with never use, current daily e-cigarette use was associated with being a former smoker of ≤2 (aPR 4.96, 95% CI 3.57 to 6.90) and 3–5 years (aPR 3.20, 95% CI 2.10 to 4.87). Former daily e-cigarette use was associated with being a former smoker of ≤2 years (aPR 1.96, 95% CI 1.21 to 3.12). Current daily e-cigarette use was negatively associated with being a former smoker of 5–10 and >10 years.