“Any passion can become an addiction; but then how to distinguish between the two? The central question is: who’s in charge, the individual or their behavior? It’s possible to rule a passion, but an obsessive passion that a person is unable to rule is an addiction…If in doubt, ask yourself one simple question: given the harm you’re doing to yourself and others, are you willing to stop? If not, you’re addicted. And if you’re unable to renounce the behavior or to keep your pledge when you do, you’re addicted.” 

Gabor Maté, In the Realm of Hungry Ghosts