This.
As usual, nanobrain is right on the money.
On one occasion, I've vaporized 100+mg and only gotten a mild tryptamine body buzz. On another occasion, I vaporized ~30mg and completely blasted off otherworldly-style. These both were from the same "machine," (dmt-smoking device) and enough time had been allocated to adjust for tolerance. DMT is a strange beast; a lovely, beautiful, orgasmic, and SPLENDID beast -- but a strange one nonetheless. Personally, I think of it less as a drug and more as some type of portal or gateway to novel realms of consciousness.