You can easily kill yourself with a water overdose (and it’s actually fairly common),so yes.

Nutmeg was already mentioned - high doses can easily kill someone, sadly even without hallucinations simply by killing off ones liver and dying an agonizing death a few days later. The same goes for cinnamon, but with a much lower dose.

There are a few more, but I don’t want to give people too many ideas.

To make it short: Yes, possible,but it’s mostly a very slow death over multiple days that fucks you up really bad and is a horrible way to go.

Sadly the hallucination effect does not correlate with the toxicity,especially the hepatotoxicity with nutmeg… You can absolutely kill of your liver and die an agonizing death a few days later and have no hallucinations at all.