hashish vs herbal tea

hashish

noun
  • The leaves and tender parts of the Indian hemp plant (which are intoxicating), which are dried for either chewing or smoking. 

  • A cannabis extract. 

  • Marijuana generally. 

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 hashish and herbal tea occurred in a corpus of books? (source: Google Ngram Viewer )