'smoke screen' definitions:

Definition of 'smoke screen'

(from WordNet)
noun
(military) screen consisting of a cloud of smoke that obscures movements [syn: smoke screen, smokescreen]
noun
An action intended to conceal or confuse or obscure; "requesting new powers of surveillance is just a smokescreen to hide their failures" [syn: smoke screen, smokescreen]

Synonyms of 'smoke screen'

From: Moby Thesaurus