I think personality traits and therefore certain behaviors can be hereditary. If you have compulsive personality traits you going to be more apt to wind up with an addiction if your not careful. That combined with being brought up in an environment where drinking is a excepted and often applauded behavior can be a recipe for disaster.
That being said, I don't think we come out of the womb look around and say, "Wow that was rough. I could sure use a drink!"