Moderation | Define Moderation at Dictionary.com
mod·er·a·tion
–noun
1. the quality of being moderate; restraint; avoidance of extremes or excesses; temperance.
2. the act of moderating.
3. moderations, British . the first public examinations at Oxford University for the B.A. degree in mathematics or in classics.
—Idiom
4. in moderation, without excess; moderately; temperately: to drink in moderation.
Thought I would just throw the definition out there. 
I beleive any addict/non-addict would create what their level of moderation is. However, if the drinking gets to a level of creating chaos and destruction and damage to health then it's done in excess which is addiction. Also, if you have to rationalize your drinking...then it's addiction.