Cannabis is the most widely used illegal substance in the world, with a global prevalence of 4% among people aged 15 to 64 years and a recent trend of growing use. Cannabis usage can have negative health consequences, such as impaired neurodevelopment, an increased risk of addiction and other drug abuse , cognitive impairment, low educational attainment, and an increased risk of mental disease, such as psychosis, depression, and anxiety disorders. Cannabis usage during methadone therapy may have a negative influence on the success of the treatment. The purpose of this study was to find out how...
