This study explored barriers and facilitators for mental health professionals (MHPs) addressing smoking with patients using the COM-B model of behavior. Interviews were conducted with 36 MHPs in England. The results identified several barriers across all domains of the COM-B model undermining MHPs practice regarding smoking cessation, including lack of psychological capability to recall training, lack of physical opportunity due to time constraints, and lack of social opportunity due to increased cultural value of tobacco after smoke-free policies. Few facilitators were identified. The study highlights the lack of physical opportunity community MHPs feel in discussing smoking due to time constraints and inability to monitor patients' progress with limited contact.