I would describe it as a predisposition; substantially more likely to be tempted and to give in to said temptation than most. I have it pretty bad and I do think there is something that drives me towards drinking and drugs that isn't just a character flaw. I do think having the predisposition is a disorder. Some people who don't have it think it is just an excuse and that it would be just as easy for us to resist as it is for them so they say stupid things.