NCT04854616.

Study name	Cessation of Smoking Trial in the Emergency Department (CoSTED)
Methods	RCT
Participants	People attending the Emergency Department who smoke
Interventions	Behavioural: CoSTED intervention: Brief smoking cessation advice, the provision of an e‐cigarette starter kit and training in its use, and referral to stop smoking services No Intervention: Treatment‐as‐usual. Signposting to NHS smoking cessation services through provision of written information about local services
Outcomes	Baseline, 1, 3 & 6 mths Continuous smoking abstinence, 6 months after randomization, CO confirmed Smoking status 1, 3 & 6 months after randomization. Abstinence prevalence, CO validated (≥ 8 ppm) Number of cpd; number of times using an EC per day; self‐reported dry cough; mouth or throat irritation; use of GP services; use of smoking cessation services. Quality of Life questionnaire. Adverse events (6 months)
Starting date	4 January 2022
Contact information	Ian Pope MD, i.pope@uea.ac.uk Caitlin Notley PhD, c.notley@uea.ac.uk
Notes	New to 2022 update