Various sites sell it. Is it safe to use? Would  be fun to get visions perhaps. Sting like hell maybe. Vomit.

If you mean snuffs blended with other psychoactive herbs, check your local laws and regulated substances list before ordering anything like that. I haven’t tried any snuff of that kind, but guess that it wouldn’t burn your nose worse than any strong snuff.

People who don’t use regular snuff find the sting intense and often describe it unpleasant. Treat any newbie with a generous pinch of Kendal Brown Original, Madras, any Indian White snuff or Hedges and ask them if that burns ;). I tried Amazonian style snuff, made of rustica and wood ashes, sting was on a par with Gul or even somewhat milder. Yopo contains calcium hydroxide, partly converted into calcium carbonate, so sting is definitely there.

https://worldherbals.com/knowledge-base/preparation-of-yopo-snuff

If yopo seeds are legal in your country, yopo snuff can be easily made at home.