My blasted Ashton Pebble Grain, Ferndown Reo Bark, Savinelli Nonpareil, and blasted Sav Antique Shell are my coolest smoking pipes. Of course they are the thickest walled pipes I own so that is a definite factor also. It stands to reason that the increased surface area in theory should dissipate heat more heat than a smooth but there are so many external factors involved that I don't know that is noticeable. Personally I have been leaning toward blasted finishes lately because the look is growing on me and I like the way they feel in my hand, not because they smoke any different than a smooth finish.