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What evidence is there that it can even be a trigger?

Not sure why you were downvoted. I haven't seen much research on any other drug other than cannabis. Correlation(not causation) between its overuse and psychosis has been documented on several occasions[1][2]. But its good evidence only for people with already some form of genetic predisposition to get diseases like schizophrenia. So its 'triggering' in that sense. Of course more work is needed on such an important topic because there are contradictory studies like this one[3].

[1]http://www.sciencedirect.com/science/article/pii/09209964940...

[2]http://europepmc.org/abstract/med/17007222

[3]http://schizophreniabulletin.oxfordjournals.org/content/38/2...

Note that [3] seems to be using historical data from patients correlating episodes with cannabis use (doesn't seem to include trials), so it's of course very susceptible to "correlation vs causaution" problems.

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