I personally find the taste just awful. I've never thrown up but I've felt like my tongue has the worst taste on it. I can't remember if I've spit or not though, its been a long time since I've smoked DMT. My last experience was last winter and I had a bad trip, my only bad trip before or since. I'm a little weary of it at this point but I'll experience it again when I'm ready.
I don't mind the taste, and I enjoy the smell (prolly in a sort of fiendy kind of way) But I have never, not once had a bad trip on it, and for a while I was abusing it, doing 100mg here, 70mg there, multiple times a day for about two weeks
I don't see it possible to have a bad trip on DMT, or maybe I'm just dense,
I've had bad trips on shrooms
closest thing to a bad trip on DMT is when I start to get the "gods beating you down bro" feeling, this feels like god is punching me in the stomache over and over, making me nauseous, also slapping my face around a bit, and overall beating me up.
I've had friends puke, but only in combination with smoking harmaline with it. (yeah, it makes it more potent try it sometime)
I can always seem to hold down the nauseous feeling, and it feels more like being punched in the gut really, too bad youre so damn euphoric, it doesnt even feel all that bad.
I always notice the nausea/beating up feeling after I get down to like like 5th or 6th hit usually, as I dont take my DMT in one or two hits, because my lungs physically can't do it, and I wind up wasting the precious dmt (and burning my throat severely every time).
If I take hits once the "god beating" begins it seems to intensify.
Thought I've also had DMT trips without the god-beatings, and I actually think they may be from concentrations of 5-meo-dmt that may be present (as Mimosa Hostilis is known to contain 5-meo-dmt, and apparently it comes with the dmt in most teks)