The air rifle CO2 cartridges are not threaded on the end.
I don't know about the vap cartridges.
I've hit several empties with my front tire.. and they shot across the street.
I'm assuming they are mostly from Vap devices and people throw them out their car windows.
Most of the cyclist I know don't throw stuff on the ground.....but don't get me started on cyclist that spit during a group ride.....no no...