For me cool implies being able to taste the flavor rather than the process of carbonizing. If ones smokes a traditional cigarette, they are going to taste the dry tobacco burning more than the tobacco itself. I think one can replicate this distasteful event if they smoke their cigar or pipe to fast and hard with overly dry tobacco. While the temperature of the smoke may not vary wildly I think one can taste when the cherry is basically hot and smoldering as opposed to burning at a nice slow pace, warming the tobacco next to it. To me, this is different than tongue burn which seams to be more about moisture in the smoke and gives a different mouth feel. I would agree cool probably isn't the best word but if taken in context, we do want the most tobacco flavor, oils, constituents etc to be what our mouth is greeted with.