There is a huge difference between mental and physical addiction. I have a very addictive personallity and adderall has never been a problem. I also can't see cocain being physically addictive. I think it's more of the high leaving that makes you want to do another line, not that you can't physically function while not on the stuff. I smoked for years and quit cold turkey. It's almost like I was addicted to the motion and having something to do rather than the actual nicotine. The only time I have felt physical addiction is when I had to get some professional help to overcome an addiction to vicodin. I took it for months when I had broken my hand and it took me a while to figure out what the hell was wrong with me. I literally couldn't do anything without them. I had absolutely no energy. Then if I even took a quarter of a pill I was like superman for half an hour. Physical addiction is some scary shit. I've had a lot of friends that have literally thrown thier lives away because of painkillers and meth.