Wow, "unbiased" BBC managed to find a doctor in Canada who can pull out bullshit like poisonings and schizophrenia. Like how they always find someone vehemently defending some fascist values and quickly give them a voice. Because kids can't get poisoned on Paracetamol if they find it and chew down on it, only weed.
Honestly, you are all tokers here. You likely know a hundred heavy tokers.
Has ANYONE EVER SEEN someone becoming schizophrenic from weed?
Sure, I have seen "psychosis" cases, where the bipolar "friend" overdid it and went totally crazy - he was crazy without weed all the time too. That's why they don't give it to everyone, especially people with EXISTING psychosis.
When my firsy psych doctor was actively agains cannabis and brought schizophrenia up, I straight asked him if he has ever seen anyone actually getting schizo because of cannabis, the answer was of course "actually never".