Reading through all the posted comments makes me scratch my head, and wonder how the statistics were generated. Common, everyday, observations lead me to this conclusion....the statistics are wrong. I believe there is little or no evidence to support the assertion that pipe-smoking is on the increase, for whatever reasons. Numbers can always be "cooked". I haven't seen a gent smoking a pipe, in public, for decades, probably over 50 years, a sight that was very common in my youth. I had one uncle who smoked a pipe, and he's been dead for 20 years. If pipe-smoking is on the increase, where are all these new pipe-smokers, tobacconists, and pipe shops? I have plenty of friends that gave up smoking cigarettes. Not one took up pipe-smoking as a substitute.
Maybe "pipe"-smoking IS on the increase if they have included, bongs, hash-pipes, chillums, vaping paraphranalia and all the other various, sleazy accoutrements of the stoner culture.