Common sense tells you he didn’t go into 17 Celebrity Rehabs for schizophrenia.
He fried his brain and psychosis set in. He never had to get a job, grow up, or live by the rules everyone else lives by.
Like Hunter, he bragged about using anything to get high.
Whether the drugs activated the mental illness genes or he was driven by mental illness to abuse drugs, once the mental illness sets in, it’s permanent.
Someone from a less affluent family would have probably ODed in the streets.