Salvia can be one of the strongest "psychedelics" (it's not really a classic psychedelic even), and can completely replace reality with something else. Often a bizarre 2D experience where someone "becomes" the floor, or the siding of a house, or whatever. Or transported to some alternative reality completely unlike our own.

It can also be extremely dysphoric and terrifying. I personally wouldn't recommend it to anyone. I have heard that chewing it produces a less dysphoric experience than smoking it though, and is how it was used in traditional ceremonies.