Smoke bomb

A smoke bomb was a explosive that, when detonated, impaired the senses by releasing a cloud of smoke.

The Second Doctor carried smoke bombs in his utility belt. (COMIC: Egyptian Escapade)

After Parry, Eric Klieg, Toberman, the Second Doctor and Jamie were taken prisoner by the Cybermen in the tombs on Telos, Captain Hopper used smoke bombs to confuse the captors while the humans and the Doctor escaped. (TV: The Tomb of the Cybermen)