It's not supernatural. And it's not blood, that fuels your inner monster, or whatever. But is it really that far off? It changes your behavior, it messes with your head, and it's become so addictive that you can't cope unless you've got a bottle in your hands.
You have a problem, Dean. And I know that it's easier to drink. I get it, I do. It's all I did after you died. But at some point, it's gotta stop. You know that it does.