. I know this feeling you're talking about, of course, but this is the feeling of the smoke interacting with the lung walls, not expanding in the lungs. Even the cleanest smoke, taken in too large a volume, will cause discomfort. But generally, the great smoke of the world can fill the average smokers' lungs with a rasta-sized hit, and cause no urge to cough. This smoke is rare to find, but I tell you, fellow smokers and searchers for the very best in the world... it IS out there, and you CAN grow smoke like this.
one way i have found to describe this to others, is if they have smoked good hookah. it is practically smoking flavored air. great weed should be better than that. and as i have said before, like smoking amazingly smooth flavored stoney air.