I have a nervous system that liked alcohol, a lot, too much and I began to obsess over alcohol. Compulsively drank it... for no good reason.
Myself... even though I am in the health care field... I spend very little time worrying about the etiology, well, maybe in a preventative sense, but in terms of treatment and recovery, unless there is co-morbidity, I don't find it much to gain in worrying about nature, nurture, genetics, whatever... Recovery is the same.
Mark