They actually mention the show by name in the article

You are referring to the machine elves I've tried DMT once, didn't see them but i did spend 30 minutes listening to a imaginary guitar during my 5 minute trip. I can not recall one single chord, but i know it's the most beautiful thing I've heard.

Im curious, they phrase it as though the hallucinations are always an unwanted side effect, but I wonder if that is the case? It makes me wonder whether it is a particularly unpleasant hallucination, i cant imagine that simply seeing little people would be described as "poisoning" or "toxic"

I didnt think that Vice was clickbait.

Nevertheless, article is about a mushroom found in Yunnan, China that causes hallucinations that last a long time and apparently always results in folks tripping out and seeing little tiny folks cruising around the place. Not the same chemical/reaction as in magic mushrooms. Sounds pretty wild.

It's just vice, you're good.

Since mice are prey animals, their brain architecture and brain scaling would likely result in them seeing little visions of their predators (e.g. cats/birds) or they'd smell hundreds of miniature mice that they couldn't really see (like synesthesia).

Nobody knows!

From Wikipedia :

Chemical and genomic analyses have shown that the Lanmaoa asiatica does not contain any known psychoactive compounds such as psilocybin or muscimol. It is likely that there remains an unknown hallucinogenic compound yet to be discovered in this species. Chemical analysis of Lanmaoa asiatica has identified numerous compounds and their pharmacological activity has been studied, but as of yet, none of them have been linked to the reported psychoactive effects.

Elfaloids and elfatryptamine.

Possibly also hydroxy-lilliputimol and/or lilliputinic acid.

The linked BBC article is a better source and say between 1 to 3 days.