I agree that people who are suffering from any mental condition, should abstain from all drug use. Drugs do alot of damage to the brain, they can interact with medications, and cause hallucinations, etc. It is very sad to know that some people continue to use drugs, when they have a mental illness.

If you have psychosis or a tendency to schizophrenia, definitely marijuana should be abstained from, as well as alcohol, caffeine and other drugs. Interestingly, even smoking cigarettes reduces oxygen in the brain and contributes towards brain damage. Perhaps this is why so many smokers have schizophrenia. My daughters mental condition always radically improves when she quits smoking cigarettes.

Regards the brains of schizophrenics, elsewhere I was led to believe brain scan abnormalities shown are a result of prescribed antipsychotic use. Without drugs, the brain of a schizophrenic is normal.

I think you could be wrong in saying that the brain of a schizophrenic is normal.
This could be of interest to you: http://www.ucl.ac.uk/news/news-articles/06 04/06041201

Actually smoking weed is the main factor which triggered my schizophrenia. I was a heavy user (everyday, one to three times at least) for 7 months. I loved it at first, but the more I used it, the worse I got. I started having really bad trips on it which included anxiety. So I looked it up, and sure enough, some cases of schizo were linked to cannabis. My advice to you, if you are not straight mentally, stay away from drugs. They will mess you up bad. Some of my other mental illnesses have gotten so much worse because of it.