Our expert says:
He may have Depression, though if this has been a long-term pattern, he could have a depressive personality ( less likely to respiond to meds, but could do well with CBT ) or Dysthymia, a form of long chronic milder depression, needing advice from a shrink for treatment.
The chronic smiking of marijuana is associated with what is called an Amotivational Syndrome, which could be a large part of the problem here. But why on earth have you all been indulging and enabling him for years, paying for him to laze around playing games, watching movies and smoking dagga ? Why would he want to change a situation in which he doesn't need to lift a finger to support himself ? Do a web search and read up about Tough Love, as he may need some, and take him to see a competent local psychiatrist for assessment and advice.
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