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Douglas Harper's Etymology Dictionary
smoke-screen

1915, as a form of military camouflage, from smoke (n.1) + screen (n.); 1926 in the figurative sense. The association of smoke with "deception, deliberate obscurity" dates back to at least 1560s.

Usage examples of "smoke-screen".

The trouble is my theory's looking shakier all the time because McDunn's convinced me it really was all just a smoke-screen: there is no Ares project, never was any Ares project, and Smout in his prison in Baghdad isn't connected to the guys that died.