reveal vs throw up smoke screen

reveal

noun
  • The outer side of a window or door frame. 

  • A revelation; an uncovering of what was hidden in the scene or story. 

verb
  • To communicate that which could not be known or discovered without divine or supernatural instruction. 

  • To uncover; to show and display that which was hidden. 

throw up smoke screen

How often have the words reveal and throw up smoke screen occurred in a corpus of books? (source: Google Ngram Viewer )