Nah, it shouldn;t be too bad if you don't smoke the bad parts too often.
You could always recrystalise the mess with some more naphta... add it all to a small tot glass, add naphta, heat till 50C and the DMT should melt right into the naphta... then pull and FP the naphta... of course you loose some product, but also most contaminants.
I realy can;t imagine someone smokeing DMT (even with contaminants) regularly enough to be a health issue...
I think you allready took it pretty far dose wise by what you described.
The stuff definatly has a sweetspot, dosage wise, too little and you are just watching a milkdrop viualisation, too much and you get shit you can't make heads or tails out of...
The world never is the same again once that 3rd eye gets forced open chemicaly.
as your smokeing skill improves (the physical heating and inhaling), you can get away with less and less... (provided you have an economical little pipe)
My pipe tends to stay so loaded after newbies try it, I can get two guys off on one dose.