Article History
Received: 28 October 2021
Accepted: 29 June 2022
First Online: 29 July 2022
Declarations
:
: This study has been approved by the UCL Ethics Committee (Project ID Number: 12621/001). Written informed consent to participate was obtained from all participants.
: Authors consent to publication. Written informed consent for publication of personal details was obtained from all participants.
: LS has received a research grant and honoraria for a talk and travel expenses from manufacturers of smoking cessation medications (Pfizer and Johnson & Johnson). None of the authors have ever received personal fees or research funding of any kind from electronic cigarette or tobacco companies. The remaining authors declare that they have no competing interests.