Booze and writers go together like a horse and carriage. This article is great in its discussion of writers and battles with booze.
I think this quote tells the whole story:
Certainly, if what you’re used to is rolling champagne bottles down Fifth
Avenue beneath the light of a wanton moon or getting into the kind of barfights
that make a man feel alive, truly alive, the basic facts of recovered life—the
endless meetings, the rote ingestion of the sort of clichés the writer has spent
his entire life avoiding—are below prosaic.
Basically writers think they are special and being an addict is not special, it means you are like everyone else. Dude, life sucks.