smoke bomb

noun
a bomb that produces a continuous discharge of smoke rather than an explosion, used to mark a target for aerial attack, indicate wind direction, produce a smoke screen, etc.

Origin:
1915–20

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World English Dictionary
smoke bomb
 
n
a device that emits large quantities of smoke when ignited

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
The pilot could also mark the sub's position with a smoke bomb.
In such cases, the chamber operator can use a smoke bomb or other device in an
  effort to determine the areas of leakage.
Held that the student ignited a smoke bomb in the stairwell of the school.
Police examined the device, which turned out to be a nonlethal smoke bomb.
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