Hallucenogenic powder

[Creeping Death]

Recently swim talked about smoking a powder in a pipe at a friends house. He smoked the powder, wich he today told me caused hallucinations and completely "fucked him up". But swim wasn't sure what this substance was.

The way he described it to me was that when he was walking home he saw a tree. First the tree looked straight ("normal"), then it started to curve over the walk way in an arch, and finally it looked to swim like he was walking on the tree. Neither of us know what it was. It was free shit, so he didn't bother to ask.

The substance was a powder (dont know what colour). He supposedly smoked it in a pipe. PCP is something thats pretty rare in sweden (i have never ever heard of anyone here using it). What do you think this substance was? Was it PCP?