I believe you will always come back, no matter how deep you go. I've experienced ego death and was separated from my body...studied my body from a few feet away and decided it was a good model. Then, off to truth, then, back to my body. Now, I've never smoked before, or combined it with acid, so my experiences may be quite different than yours. I know I will try to go much deeper the next time I drink that wonderful brew, and I'll go without fear. I do not believe it's possible to "go insane" by using dmt. Just my 2cents
*edit* I'm not suggesting folks should get crazy with high doses of dmt...I'm just saying I don't believe it will cause harm in high doses. This is only my opinion and not backed up by anything other than a trust I have with it. I plan to triple the amount of goodies the next time I brew (waiting on material). I have no fear with this decision. Again...just my opinion