The oxford dictionary definition puts it down as:
A disorder of structure or function in a human . . . A particular quality or disposition regarded as adversely affecting a person
I guess it could be argued alcoholism could fit in there somewhere, but as others have also said, I don't focus on the ins and outs of it too much, or even use the label alcoholic that much, all I know is if I don't drink today I'll be improving my life to some degree!!