Hello Sir
Addiction is a disease not a habit. Addiction change behaviour patterns and can change personality paytern from previous ones.its not a psychosis. He is not understanding that he is harming himself, reason is he knows its painful to stay away from substance and he is not ready to face the pain. That's why he is denying to seek help. Addiction is a family disease so its obvious that the whole family will get affected. There are different modes of treatment for addiction, like rehabilitation, detoxification and psychological interventions. At present i dont think he will be ready to go to any rehab. So we cam start with psychotherapeutic help. It will help your child to develop acceptance and motivation to quit. We should start from somewhere, and this mode of treatment will be more acceptable for patient.
Next Steps
consulting a clinical psychologist will be advisable. And not only patient's but also family must undergo some therapy sessions
Health Tips
you can also visit my clinic by booking an appointment through practo app.