I think the increase in cases is more likely to be explained by a number of factors:

1. THC concentrations have increased which usually means there is less CBD. 2. Legalization probably increased casual use. 3. People who suffer from schizophrenia are simply more likely to be diagnosed for whatever reason.

The sum of these three things could easily account for a significant increase in diagnosis.

Sometimes increases in diagnosis correlate with better detection. Sometimes they correlate with incentives to diagnose people. I’m not even suggesting a nefarious connection. Sometimes incentives with the best intentions can have a big impact.