Alcoholism is thought to be a combination of genetic and behavioral factors. It appears that some people have a genetic predisposition to alcohol addiction, and that if they drink enough (sometimes for quite short periods) they will become alcohol dependent.
The behavioral factors dominate, however. For example, a person with a genetic predisposition will obviously not become an alcoholic if she never takes a drink. On the other hand, just about anyone will become addicted to alcohol -- just like any other drug -- if he drinks heavily for a long enough period.
A third factor is the question of why we pursue the alcohol high to start with. Social drinkers have different motivating factors than, say, someone who drinks to help suppress the effects of emotional trauma, or who self-medicates a neurochemical problem. Thus, we say that what matters is not how much we drink, but why we drink, and the effect that the drinking has on our lives.
Alot of it depends on your past. Alot of people think that alcohol is the answer to having a rough life or losing the one you love. Therefore, the longer the pain is there, the more alcohol they will drink to get it off their mind. Or, other times, some people just love drinkin it because. But i believe alot of it has to with past and present.
GET DRUNK, DUMBO! hahaha