skunkweed vs spliff

skunkweed

noun
  • strong-smelling cannabis 

  • Any of several American plants that have an offensive odour, but especially Croton texensis and Polemonium viscosum 

spliff

noun
  • A cannabis cigarette. 

verb
  • To smoke a spliff. 

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