420 vs Camberwell carrot

420

noun
  • Cannabis. 

  • A particular type of monohull dinghy with two sails, designed for two people. 

adj
  • Pertaining to the consumption of cannabis or to cannabis culture. 

Camberwell carrot

noun
  • A large cannabis joint. 

How often have the words 420 and Camberwell carrot occurred in a corpus of books? (source: Google Ngram Viewer )