Alcohol is the most frequently abused drug in society. Alcohol is chemically classified as a mind-altering drug because it contains ethanol and depresses the function of the central nervous system. This depression affects motor coordination, speech and vision. In great amounts, it can affect respiration and heart rate control. Death can result when the level of blood alcohol exceeds 0.40%. Prolonged abuse of alcohol can lead to alcoholism, malnutrition, and cirrhosis.