I'd expect some of the larger pipe tobacco makers, especially those with reach into other tobacco markets, and with international marketing, have working figures on the number of pipe smokers worldwide and in specific countries. I don't know how much research on this, and on breaking out the pipe smokers from other tobacco users, is cost effective, but a large corporation would certainly look into this, whether they'd assign a graduate school intern or a team of seasoned researchers and stat people. These figures might be worked up by marketing or sales, or hired out to research contractors. When corporations pay for something, they don't share it, since it would be a competitive advantage to know how many and where pipe smokers are. Out of 327 million people in the U.S., does one in 33 smoke pipes? That'd be one percent? Sounds high to me, but since we've been driven into privacy, or lonely walks, it could be true. I'd guess less than half a percent, maybe even less than a quarter. The internet makes us feel numerous, but we're borrowing from other countries here. If my math is stinko, sorry about that. But my guess stands.