A good book answers your questions. A really good book answers questions you had not thought of yet. Apparently Tim Brook’s Vermeer’s Hat is a really good book, as it is already answering questions I did not know I had. Among the many topics Brook discusses (the book is about globalization in the 17th century) is the history of smoking. He points out that this was a new habit in China (and everywhere else) and he also talks about pipes. I had always known that Chinese pipes were rather long, both the tobacco pipes like this or this
and the opium pipes like this
(( Note that when selling things on Ebay you can call them all opium pipes )) Brook explains that the reason for the long pipes is that smoking was considered a particularly yang thing, and you wanted to let the heat of the smoke cool (or de-yang) itself as much as possible. This is why smoking was not advised for women or old men, why women’s pipes were so much longer than men’s and, I presume, why cigarette smoking among women was considered so risque in the the 20th century.