Is your life harder to manage because too much coffee? yes = addiction; no = acceptable

Is your life harder to manage because not enough coffee? yes = addiction; no = acceptable

I don't disagree with you. I'm just hoping to point out the flaw in that logic. Effect on life management is one aspect of one type of addiction in my opinion. There is more than one type: mental (pathologically doing something known to be unhealthy i.e. smoking) and physical (negative physical symptoms after ceasing something routine i.e. opiate withdrawals) come to mind. I could argue there are also social and antisocial addictions (i.e. gambling and masturbation) which can still be done without immediately making ones life harder to manage, but they might and eventually will, most likely, but not necessarily.

Addiction can be nuanced. I feel it's important to not set a bar like that, as an addict will use that to excuse or enable or deny that their unhealthy behaviour effects their life, sometimes without even realizing it.