Addiction the way you mean is a mindset. Indulgence in moderation doesn't mean addiction, giving something up still lets that mindset control you.
Physical addiction has obvious signs when you go without. Shakes, headaches, sweating, pain, nightmares, etc. You can be physically addicted to both alcohol and cigarettes, but just being a user doesn't make you an addict.
You call it justification, I call it life improvement through narcotics.
@jdc Oooh!!!!! I finally get it! Thank you for the elaborate explanation (and for making me understand and differentiate).
I am starting to love steemit and people using it!