inhale vs pick at

inhale

verb
  • To draw air into the lungs, through the nose or mouth by action of the diaphragm. 

  • To draw air or any form of gas (either in a pure form, or mixed with small particles in form of aerosols/smoke -sometimes stemming from a medicament) into the lungs, through the nose or mouth by action of the diaphragm. 

  • To eat very quickly. 

noun
  • An inhalation. 

pick at

verb
  • To touch, grab, handle, or pull tentatively or gingerly, using a utensil or one's fingers. 

  • To pick on or repeatedly criticize (someone). 

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