Very esoteric topic!!!! and most interesting examples of weapons curiosa.
The Chinese opium den is almost cliche' in romantic literature and narrative, and these pipes are fascinating. I had not heard of them used as weapons, but as presented here, completely understandable. It seems that when it comes right down to it, nearly anything can become a 'weapon of opportunity', noting the martial art using fans as one example.
The weaponry of the ascetic fakirs in India seem to have remarkable similarity in concept, with the dagger concealed in one form of pipe shown here.
While noting the combination use of the Chinese pipe, I could not resist thinking of the Native American 'peace pipe' tomahawk. These Plains Indian items had the poll of the axe head in the form of a small pipe bowl, and these were highly symbolic in ceremony, and as a tool and weapon.
From what I understand, the 'tomahawk' (Algonquin, -tamahak) form of the 'calumet' (Fr.=reed) peace pipe, did not present until post contact.
Whenever these interesting socio-anthropological features are brought together in discussion noting similarity, it is fascinating to consider the dynamics of cross cultural influences.
......'ere!
All the best,
Jim