Effects of vaping on physical and mental health in at-risk populations (VAPE): mixed-methods study of motivations for and perspectives on vaping in patients with opioid use disorder - Alessia D’Elia; Balpreet Panesar; Nitika Sanger; Laura O’Neill; Tea Rosic; Leonora Regenstreif; Kevin Park; Claire de Oliveira; David C. Marsh; Luciano Minuzzi; Lehana Thabane; Zainab Samaan (BJPsych Open)