King's College London

Funding Information: S.B.'s research related to cannabinoids has been funded by: the Medical Research Council, UK; the National Institute for Health Research (NIHR), UK; the Wellcome Trust; the European Commission; the Dowager Countess Eleanor Peel Trust; Parkinson's UK; Rosetrees Trust; and Alzheimer's Research UK. S.B. has participated in advisory boards for or received honoraria as a speaker from Reckitt Benckiser, EmpowerPharm/SanteCannabis, and Britannia Pharmaceuticals; and is working in ongoing collaboration with Beckley Canopy Therapeutics/Canopy Growth (investigator-initiated research), wherein they are supplying the study drug for free for charity-funded research (Parkinson's UK and NIHR Guy's and St Thomas' Biomedical Research Centre). Z.S. is a member of the BJPsych editorial board, and did not take part in the review or decision-making process of this paper. Publisher Copyright: Copyright © The Author(s), 2022. Published by Cambridge University Press on behalf of the Royal College of Psychiatrists.