As a recovering alcoholic (25 years), this is my take on narcissism and alcoholism. I'm sure there are alcoholics who are also narcissist but the two aren't necessarily related. In AA's Big Book, Bill Wilson describes alcoholics as "self centered in the extreme, selfish, enormous self-will coupled with low self esteem". It's the psychology of the disease and simply abstaining from alcohol doesn't change the person much. The 12 Steps of AA are designed to ameliorate these tendencies and cognitive therapy can also help, but it is hard work and takes many years.
"His majesty the child", I've heard it described. I think recovery is about growing up, becoming a responsible person who doesn't always put themselves first.