What type of pain killers? I would be worried about that if your pain killers are anything stronger than asprin. Any addiction, mental or physical, is bad when it affects your life nagetively. If you wonder whether you are addicted to cafeine or not, you probbably are. Either way, addiction is an enemy of life. We can get silly and joke about coffee and soda, but if you are really worried about a habit, then change it. I personally smoke and consume large amounts of caffeine, but right now it doesn't worry me, but I defintely have no plans to keep that up for much longer. As someone who is not a medical pro I can't say 100% but addictions suck and will drain the life out of you. Not to sound like I am rambling or preaching, try to kick it if you are worried. Anyway, this is my first post to a slashsdot discussion. hooray for me I even spellchecked real quick