I don't have a habit ...
Personally speaking, I have neither a drinking habit nor and addiction to alcohol that, thankfully exists no more and hasn't done so since Feb.,2008.
That said I do suffer from alcoholism which is a two fold illness consisting of a physical allergy and a mental obsession and is the only illness that'l kill you whilst telling you,you haven't got it! The only respite from which is abstinence...
So as Dee 47 so rightly said the question of habit or the quantity of drink taken doesn't really come into it. what, certainly for me and many others comes into it is the question, can you stop drinking when you want to ?
If alcohol is costing you more than money you might just have a problem, that makes it much more serious than a habit....