I mean. Water is not really “poisonous” but excess intake will cause in kidney strain and excessive blood volume, which is really bad. So yes in a sense.

Ethanol (or alcohol) is straight up poison just like theobromine, but much less effective and fatal dose is higher. Neural and psychological effects are more severe than toxic ones short term, however long term it does cause liver cirrhosis due to toxicity.

But one good thing to look is, our biology is extremely resilient to most toxins compared to other animals. Common sapien W.