smoke and mirrors vs trapping

smoke and mirrors

noun
  • A deceptive, fraudulent, or unconvincing explanation or description. 

trapping

noun
  • An instance of ensnaring something or someone. 

  • An ornamental covering or harness for a horse; caparison. 

How often have the words smoke and mirrors and trapping occurred in a corpus of books? (source: Google Ngram Viewer )