Given the number of times that you have caught him the promise of not doing it again seems somewhat empty. If he struggles with depression and ADHD smoking weed regularly is going to exacerbate his condition and also counteract any medication he may be on.
I would recommend that you make contact with Cape Town Drug Counselling Centre at www.drugcentre.org.za If you do not live in Cape Town they will be able to advise your nearest facility for further advice.
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