This study looks at tobacco use among persons with psychiatric disorders and its management in public psychiatric units in France. A thematic analysis based on semi-directive interviews with 10 patients and 9 caregivers was carried out. Patients use tobacco to deal with their emotions and mood swings. However, mental health professionals, who only focus on mental disorders and addictions that have a direct impact on behaviors, disregard smoking addiction. Moreover, tobacco is sometimes integrated into the way services operate. However, it would be too simplistic to reduce the issue of smoking cessation to a matter of goodwill of caregivers. The structural dimension of smoking was evident, particularly in psychiatric hospitals, where it was an important bargaining chip and activity. Patients desire to receive individualized smoking-cessation interventions. This underlines the relevance of a public health intervention co-construction that goes beyond simply prescribing nicotine substitutes. This intervention should take into account characteristics of tobacco consumption among psychiatric patients, and the need to offer such interventions when patients are stabilized. In the meantime, psychiatric caregivers should be encouraged to engage in shared decision-making processes with patients for tobacco-use reduction and cessation.