So how could they have used it as a fill-in track?
Besides 'Smoke' is on my list of one of the 5 "all-time greatest Rock songs of all time". Not because it was a stunning piece of music--it wasn't--it's a 70's 3-chord special. Howver, it makes the list because it is a song that everybody recognizes (witness the car commercial where only the first 4 notes are played...everybody recognizes it, even my rock-hating wife); it is quintessentially Rock'n'Roll (with capital letters), and just about every punk kid who's ever picked up an electric guitar instinctively, and irresistably, sooner or later slams out the chords to it. They simply can't help themselves. That's why its on my list.
For the record, I don't particularly like the song either....