> The important question is that whether this relationship is disruptive, neutral or positive (like being addicted to training). Drinking isn't inherently bad, but the author thinks so. My impression is that there are equal number of studies on pro/contra moderate alcohol consumption.

Not sure if it's part of the 'official' definition of addiction and forgot what the source of it was, but I always liked the explanation that if there's no negative (emotional) feedback loop, it's not really an addiction, but just a habit.