Kelly was apparently obsessed with smoking, at least as a visual motif - in Pogo, just about every character smokes at one time or another, often in various impossible or visually hilarious ways. For example, one character spends most of a strip playing a saxophone, then, in the last panel, proceeds to lower a match into the 'bowl' of it and puff smoke like he was lighting a pipe. Another one does something similar with a paintbrush, which he wields like a cigarette holder. It was pretty funny, but it's nothing you could get away with today, unfortunately.