chimney pot vs tobacco pipe

chimney pot

noun
  • A short earthenware pipe, placed on top of a chimney to improve the draft. 

tobacco pipe

noun
  • A small, hand-held device consisting in its simplest form of a bowl and stem; used for inhaling the smoke of burning tobacco. 

How often have the words chimney pot and tobacco pipe occurred in a corpus of books? (source: Google Ngram Viewer )