coke vs crack cocaine

coke

noun
  • Cocaine. 

  • Solid residue from roasting coal in a coke oven; used principally as a fuel and in the production of steel and formerly as a domestic fuel. 

verb
  • To add deleterious carbon deposits as a byproduct of combustion. 

  • To produce coke from coal. 

  • To turn into coke. 

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. 

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