ALCOHOL. The word "alcohol" is derived from the Arabic word al kuhul, meaning 'essence'. The favorite mood-altering drug in the United States, as in almost every human society, continues to be alcohol. One of the reasons for the significant use of alcohol and its health impact is its feature of being (along with nicotine) a legally available drug of abuse and dependence.

Our knowledge of alcohol rests on a heritage of myth and speculation. Many health benefits have been attributed to alcohol by ancient healers who saw ethanol as the elixir of life, but almost none of its positive benefits have stood the test of time. Alcoholic beverages have been revered, more than any other substance, as mystical and medicinal agents. In recent years, however, we have stripped away much of the mystery surrounding alcohol and now recognize it as a drug with distinct pharmacological effects. However, one of the reasons that beverages...