AAAHHHH the U.K,God bless her and all who sale on her (legally or ilegally).
From what I can gather the link with Schizophrenia hasnt yet been clinically proven (this wont stop them shouting about it however!). People who already have a high chance of suffering from Schizophrenia could find that cannabis smoking over an extended period of time can induce/enhance the Schizophrenia.
The answer seems simple enough, if you are Schizophrenic then dont smoke it, if it induces Schizophrenia then stop smoking it.
Adults making an educated choice, aaaahhh Utopia!