What you don't understand is that addiction is actually a symptom of another illness and doctors would like to get rid of the concept of addiction, but they can't because it'd collapse a billion dollar industry, turn the DEA and the rest of the government against them, and they'd never hear the end of it from the lay people. "Preoccupation and duration of use" are fuzzy weasel words without any clear definition tacked on to this criteria simply to appease us wall-eyed villagers.