Weed Day vs cannabis

Weed Day

noun
  • April 20th of any year, regarded informally as a time to celebrate marijuana consumption. 

cannabis

noun
  • A mildly euphoriant or sedating, intoxicating hallucinogenic drug prepared from various parts of this plant. 

  • The purified and decarboxylated resin of the cannabis plant used for medicinal purposes rather than for any intoxicating effects. 

  • A tall annual dioecious plant (Cannabis, especially Cannabis sativa), native to central Asia and having alternate, palmately divided leaves and tough bast fibers. 

How often have the words Weed Day and cannabis occurred in a corpus of books? (source: Google Ngram Viewer )