Spinazzola, Edoardo and Degen, Hannah and Austin-Zimmerman, Isabelle and Trotta, Giulia and Chesney, Edward and Li, Zhikun and Alameda, Luis and Leung, Bok Man and Lang, Yifei and Quattrone, Andrea and Quattrone, Diego and Castrignanò, Erika and Wolff, Kim and Murray, Robin and Freeman, Tom P and Di Forti, Marta (2025) Are reasons for first using cannabis associated with subsequent cannabis consumption (standard THC units) and psychopathology? BMJ Mental Health , 28 .