Now he urges consumers to educate themselves as increasingly potent cannabis products become commercially available in Canada. Naturally occurring cannabis plants contain one to two per cent THC; genetically modified plants are cultivated to boost the percentage. Today, the amount in plants is much higher, and commercially available processed products can contain 20 per cent THC or more. Health Canada does have warnings online to "avoid cannabis completely" if you're at risk of psychosis or schizophrenia. He said it's important to understand that today's cannabis products are often stronger and act differently than a joint passed around in a basement in the '70s.
