Many years ago, when I smoked, that was an excellent method of holding the floor while thinking through one’s comment. You would start off with “Well. . .” and take a drag off of your cigarette, let out the smoke slowly then begin speaking. I think that was the only thing I missed when I stopped smoking.
Then I had to come up with meaningless substitutes like, “You make an excellent point, but. . .”, “Interesting observation, however,. . .”, “If we consider it from a bit different perspective. . .”