The powder of the dried nuts was at one time prescribed as a sternutatory (to encourage sneezing) in the Edinburgh Pharmacopoeia.
It is now almost solely used as a sternutatory or errhine, and is probably one of the best.
sternutatory ster·nu·ta·to·ry (stûr-nyōō'tə-tôr'ē, -nōō'-)
Causing or producing sneezing. n.
A sternutatory substance, such as pepper.