I'm new to psychedelics, and in general rather cautious with them. For me, being inefficient with DMT is one of the great boons of the drug, because its easy to experiment. I've only ever had enough DMT to do this once, but one of the best trips I've had I've toked multiple times on some enhanced leaf. I know that DMT w/o MAOI gets rapidly less efficient, but there is nothing like being able to say, "ok, I'm handling this ok, lets go deeper."
On that particular trip my pipe started looking like a snake after the third toke. I threw up (despite not using an MAOI and having fasted for ever), and then I went into preliminary hyperspace and saw pinks and love and a general desire to go home, which was exactly what I was doing and needed to hear at the time. If I wasn't so comfortable at that point perhaps my trip would have been darker....
No idea how much DMT that was but I'm sure that a veteran would have been able to enter into full hyperspace using half of what I did; I'm sure I'll do the same later on. For now I want lots of DMT just so I can be comfortable.
Its amazing how paradoxical DMT can be. Veterans use less; novices use more. With other drugs that usually isn't the case.