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.
RE: The problem we have with cigarettes