Briar, unless it has an unseen flaw, probably accommodates low temperatures in which you'd
be likely to smoke, pretty well, I would guess. But it's just me guessing. I think with old celluloid
film, small electronic devices, cameras, etc., it never hurts to keep the items in your layers of
clothing (like under your coat) to keep them nearer a normal temperature. With a pipe this would
help, so it isn't going from nine below to burning temp all at once. Once the leaf is burning, it has
its own heat source, which will last a while. I grew up near Chicago, in the old days when the winters
were markedly colder, and my pipe smoking dad would smoke his pipe outdoors often, and for
long periods of time, and it never caused a problem. He smoked mid- and low-level briar billiards.