Thanks for your replies. I guess the best way to know is to experience it urself, and there's no way I can get my hands on something so illegal. I come from a rather scientific background, so I'm quite hard nosed on the reality of these realms, I need verified knowledge of something in the real world to believe they really exist.

I've read a lot on what NDEs and DMT experience. While there are similar aspects, I can guarantee NDEs are not caused by DMT. But there's a chance NDEs are caused by a currently unknown psychedelic chemical released by the brain. NDEs have veridical experience, but we can't be completely sure that the person's soul really left his/her body, because there's no veridical perception under controlled studied yet, all existing cases are anecdotes. I was hoping DMT users might have veridical perception.