Funding for this research was provided by:
Cancer Research UK (C1417/A22962)
Received: 5 December 2019
Accepted: 17 March 2020
First Online: 6 May 2020
Ethics approval and consent to participate
: Informed consent was obtained prior to each interview. Ethical approval was granted by UCL’s Research Ethics Committee (2808/005).
: Not applicable.
: EB and JB report grants from Pfizer to study smoking cessation outside the submitted work.