Are salvia trips kind unwanted and random shifting?

I'm new here. I'm interested in phychedelic stuff and I have some questions.

1. Some people say they became things like tree, rock, one dollar bill and couch after smoking salvia. Are these things shifting? Is it possible to become a tree without smoking salvia even tho I can never imagine what being a tree would be like.

2. Can I learn a language in my dr then come back and speak the language fluently.

3. Can I go to the reality that I'm in enlightened state and go back to my CR and maintain that state of consciousness