Is this adjusted by amount of use? As in, is it possible that it's more likely to trigger latent mental illness with alcohol and cannabis not because they trigger it more effectively, but because they are significantly more widely available, significantly more widely used, and people who consume them consume them in significantly greater amounts?
If you get drunk once, I get high once, and our friend trips on psilocybin once, what is the comparative risk of activating latent mental illness for these events alone?