I don't think I have any form of chemical addiction to anything (essentials like water and oxygen do not count!). I mean, I used to consistenly drink caffeine every day, but when I stopped for a couple months I suffered nothing even remotely like withdrawal. I don't get withdrawal from gaming or computers or anything 'nerdy'. I don't drink, smoke, do drugs or gamble ... most of my avoidance of addictive things is about self-control (the idea of being psychologically dependant on a non-necessity scares me, like self-inflicted, mental slavery), but for the purpose of this thread, the closest thing I have to an addiction is videogames (based solely on my time spent on videogames/free time ratio).