This factsheet analyses how behaviour and attitudes to e-cigarettes among adults aged 18 and over have changed over time. The Smokefree GB analysis conducted by ASH is based on data collected by YouGov for ASH, and is carried out in the Spring each year. The survey first started asking about e-cigarette use in 2010 and this update includes the results of the 2023 survey carried out in February and March 2023. Appendix 1 sets out the methodology in detail. Set out below is a summary of the key findings.