I am a DMT enthusiast, supporter and have frequent lift-offs into the nexus. I'm sure you know all the good stuff already, so let me tell you the bad stuff.
Don't burn it.
DMT (through experience) can hurt the lungs. Keep fire away from it. To much smoking will cause pain.
DMT has a way of letting you know how much you can lift off, to keep you away from abuse. But the shear magic and familiarity of DMT, sometimes makes it hard not to go back all the time. DMT is only effective every 2-3 hours or so, continuous smoking dose nothing, so save your lungs. I would wait a few days before next lift off.
Just remember, when you become overwhelmed with sensation and you start to take off, just remember, your going somewhere that you came from. so there is nothing to worry about. If you have a bad experience just remember it is for the good. DMT is like a harsh mother. If you have a clear grip on yourself with good karma there is nothing to worry about.