I’ll do you one better, my school loved to take us on trips to various mines so I have licked the walls of salt mines several times now. Salt kills biological hazards at least, so it’s a lot safer than one might think

I’ve licked a few too and am also alive. I suspect that they are deadly and that you and I are the only two who are immune to it.

Well, there was a recent AI mistake which recommended sodium bromide, which causes psychosis. So results may vary, particularly by quantity.