That DMT "stings" a little in the mouth and lungs is normal as far as I know. And I've never been too fond of the taste/smell either
But I see that as a small price to pay for an amazing experience that can very effectively cathalyse psychological healing, Psychological development(into a more stable, hapy & wise human being) and rekindle Creativity when it's blocked. But only if the user of DMT seeks these things, Consciously or subconsciously, will he/she find them I should add.
J98:
Since I am relatively poor, like you, I too have never bought a GVG or other specialised vap-pipe.
I have allways used 2 methods(for smoalking DMT) that are both cheap & effective;
1- Roll a Cigarette or Cannabis Joint & Sprinkle some DMT in there. Top it off with a bit more Tobacco and/or weed.
(If the DMT is sandwitched in the center of the joint it will be somewhat protected from burning in the direct flame)
2- This is what I used on my first DMT journeys: A regulair Base-pipe, often called simply "Crackpipe".
It doesn't sound glorious, I know, but it vaporises DMT decently. However I found the Joint much more fail-proof.
Sometimes not sufficient amounts of DMT would vaporise in this pipe. Sometimes you'd get far too little, other times you'd get FAR more than you bargained for

So because I like to be able to finetune the dosage and so the intensity & depth of the DMT experience, I much prefer smoalking DMT in joints. ( Allthough this way some DMT will get burnt so it's wastefull and not advisable if you have only very little DMT )