Counting your steps is unlikely to destroy your life, but a lot of people do suffer serious harms due to behaviours like compulsive exercise and orthorexia. Obsessive-compulsive behaviour around exercise often overlaps with anorexia nervosa, which has the highest risk of mortality of any mental disorder (~5% at 10 years). There is a surprisingly fine line between compulsive health tracking and a life-threatening eating disorder.
> Addictions do not have to be life destroying. Plenty of people are addicted to various things but are fully functional and live fulfilled lives. It’s a bit unfair to ask whether OP wants words to have any meaning when it seems you’re a bit fuzzy on the definition of “addiction” yourself.
Wikipedia: Addiction is a neuropsychological disorder characterized by a persistent and intense urge to use a drug or engage in a behaviour that produces natural reward, despite substantial harm and other negative consequences.
A third of the diagnostic criteria for substance addiction are about negative effects in the person's life. Perhaps it's not strictly a requirement but often it's only a question of time.
No? So maybe don't call it an "addiction" if you want words to have any meaning.