title_body: Is coffee/caffeine addictive?
upvoted_answer: Short answer is, yes.
  
  This topic has been discussed a few times and mostly related to caffeine. Please see this previous question:
  
  
  Can decaf coffee be addictive?
  
  
  And, about being low after quitting coffee after a while... This is mostly relevant to caffeine withdrawal and discussed on this question: 
  
  
  Why do I feel lousy, low, out of energy after the high coffee gives?