Yeah about that, I noticed that if you suck the joint with your tongue, so the smoke fills your mouth, then inhale all quickly then it wont condense so much into the part of your lungs where little hairs make the resin move up (forgot the name) bronchia ?
Anyways, if it condenses in your lungs usually you don't cough, and I agree a good quality vaporiser is the way to go.
You can make a cheap vaporiser by finding some very thick aluminum (it has to be thick, almost like the little pie plates) and shape it to the end of a glass. Then put that aluminum on the stovetop for a while a heat it real good (maybe your stove can make it too hot and melt/vaporise it, be careful and do some tests)
This should vaporise all the aluminum dust that isn't part of the main piece and this makes sure you don't end up smoking aluminum (its very nasty and makes you cough)
Then you just have to add your favorite legal herb and heat gently from below, do not put the flame direcly on the aluminum, it will vaporise in very small quantities and is very toxic.
You can then let it cool a little, open it gently and stick a straw in there