Many ninja use blowguns, as light weapons or as distractions. It may be used as a means to deliver poisons. A blowgun dart is larger and heavier, and does more damage than a blowgun needle but the needle is just as good at carrying poisons. Blowguns can also be used as breathing tubes for swimming underwater. A blowgun can also be used as a jo stick or the scabbard for a sword.

Fukiya is traditional Japanese (read ninja’s) blowgun. It is 4 feet long tube blowgun, with darts around eight inches (around 20 cm). Fukiya has no mouthpiece so users wrap their lips around the pipe. The darts used in the fukiya were called fukibari. Traditionally, fukibari were two inches in length.

You can find some extra info here about blowgun here Blowgun and about fukiya here Fukiya.
Ordinary people (non ninjas) think blowgun is a sport Blowgun sport.

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