Impact of Cannabis Consumption on Psychotic Symptoms and Reality Monitoring in Patients With Schizophrenia: a Real-life Study

Inclusion Criteria: * DSM-5 diagnosis of schizophrenia or schizo-affective disorder with the following clinical features: * Clinically stable and in the residual (non-acute) phase of illness, * No change in antipsychotic treatment for at least 1 month, * Outpatient, ambulatory care, * No uncontrolled positive symptoms (assessed using PANSS) * Patients able to use a mobile phone. * Capacity and willingness to give informed consent. * Must be able to read, speak, and understand French * Patients subscribing to the French national medical insurance. * Patients under "curatelle" (partial guardianship) are eligible Exclusion Criteria: Patient under "tutelle" (full legal guardianship). * Psychiatric comorbidities: autism, bipolar disorder. * Current criteria for any other substance use disorder except for nicotine use disorder. * Any medical condition hindering the study and/or use of the smartphone application. * Patients with somatic, cognitive or other disorders preventing the use of the device (deafness, impaired vision, illiteracy….). * Pregnant or breastfeeding woman. * Patients who are not proficient in French. * Subject included in clinical and/or therapeutic experimentation in progress.