[monktastic1]

It really depends on how much you do. On a sufficient dose of LSD or mushrooms, you can lose all connection with physical reality for (what seems like) eons, and "travel to" (or construct?) arbitrarily weird places. But for those substances, it may require more careful setup (quiet, dark room, eyeshades). With DMT you don't have much choice.

[sixQuarks]

I totally agree, depends on the amount you take, and also your state of mind and how willing you are to "let go".