If you enter any server with at least 2 people in total with vehicle smokes enabled (Ifrit/Strider), firing the smoke countermeasure will cause the smoke canisters to play multiple more collision sounds than expected.
The extra sounds do NOT play when you are playing locally or on a server with only one player.
I assume this is causing more network traffic than normal, however I have nothing to backup that claim.
This can be replicated on every Arma 3 server I have been able to test, including a base VR world I loaded onto my own server with loopback.
I did not test if it is creating multiple invisible smoke objects, but none are visible when this occurs.
I attempted to run the countermeasure code on my player, instead of executing from a vehicle, and it did not cause the sound bug.
It is present in servers and clients all running the latest 2.18 v8 profiling build as well as server/clients running 2.18 Stable