According to the American Medical Association and the World Health Organization Alcoholism is a disease. An alcoholic can't ever have one drink. The first drink triggers their alcoholism, which is a craving for more and more drinks.
They say "one drink is to many and a thousand is never enough". I work in the rehab industry here http://www.addict-help.com. Millions of people die every year from alcohol related events. If you or someone you know has a drinking problem, get help, please.