Smoke grenade
A smoke grenade was a non-lethal grenade that gave off thick smoke when it exploded. They were usually used to provide cover in the form of a smoke-screen.

In 2370, a Starfleet officer threw a smoke grenade to provide cover for Chief O'Brien and Li Nalas after they were pinned down in the promenade security office, during General 's take-over of Deep Space 9. ()

See also
Gas grenade

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Hand-held weapons