hemp vs herbal tea

hemp

noun
  • Various products of this plant, including fibres and the drug cannabis. 

  • A tall annual herb, Cannabis sativa, native to Asia. 

  • The gallows. 

herbal tea

noun
  • A beverage made by infusing the leaves of various herbs, generally not including true tea (Camellia sinensis). 

How often have the words hemp and herbal tea occurred in a corpus of books? (source: Google Ngram Viewer )