herb vs nicotine

herb

noun
  • Cannabis. 

  • A lame or uncool person. 

  • Any green, leafy plant, or parts thereof, used to flavour or season food. 

  • A plant whose stem is not woody and does not persist beyond each growing season 

  • A plant whose roots, leaves or seeds, etc. are used in medicine. 

nicotine

noun
  • Tobacco, cigarettes 

  • An alkaloid (C₁₀H₁₄N₂), commonly occurring in the tobacco plant. In small doses it is a habit-forming stimulant; in larger doses it is toxic and is often used in insecticides. 

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