Remember not to torc hthe DMT, keep the flame a little distance away and just patiently suck on your pipe until the vapour becomes visible (which is why I prefer a small glass pipe).
If it tastes bad you are burning it.
You should realy not be coughing... I wonder if you didn't maybe also transfer some of the lye tea when you did your pulls... (which is why you always pull into one vessel and then transfer that to FP dish) gravity tends to pull the brown stuff to the bottom.
Either way, if you can keep it in for 20 seconds or so, you should no longer be aware of haveing lungs...
The stuff is alot like salvia... the trick is to hold your breath in with the smoke until jesus comes.
My damn camera's batteries are flat again. Will post a pic of a cool DMT pipe later, it has a ball made from those small brass pipe screens you get at the headshop in the bottom as a bed.
Not haveing a plant base in there means DMT that condenses on the inside can be harvested with dry acetone and evaped off again, WITHOUT ANY TAR.