crack cocaine vs tornado

crack cocaine

noun
  • A mixture of baking soda and cocaine in solid form that is smoked in a pipe as a narcotic. 

  • A mixture of salt substitute, ether, and cocaine in a semi-liquid form, which is far more potent than if made with baking soda alone. 

tornado

noun
  • A violent windstorm characterized by a mobile, twisting, funnel-shaped cloud. 

How often have the words crack cocaine and tornado occurred in a corpus of books? (source: Google Ngram Viewer )