Some habits can be relatively benign, even when addictive: caffeine, the athlete’s highs, haute cuisine, tidiness. A benign addiction to coffee can tend to its own daily limit, where the marginal cup of coffee decreases the sought after acuity of thought that motivated the habit in the first place. And you can only run so many miles every day without crippling your ability to run.
Some habits – as prayer, music, discipline, training, courage, thoughtfulness, care, attention, gratitude – are virtuous, and incline us more and more to virtue in every department of life. Virtue is in itself, and in all its varieties, an addictive pleasure, that tends to the general increase of virtue and to the correction, harmony and vim of the whole organism. The virtuous addiction to prayer, for example, tends to permeate life, integrating, settling, and healing it.
Benign addictions then are self-limiting, while virtuous addictions salve and ennoble the whole person, more and more. Both sorts tend toward balance, toward what the Greeks called krasis – the just mixture of ingredients in a mixing bowl or Receptacle (a krater).
But many addictions catch the addict in a vicious positive feedback loop wherein ever stronger doses of the addictive pleasure are needed in order to reproduce its characteristic hedonic effect. Eventually the doses, and the need for them, grow so large as to be all-consuming, toxic, and so eventually lethal, somehow or other: to the body, the balance sheet, the career, the family.