Alcohol was a substance that had mind-altering effects on certain organic species. Various type of beverages consumed by sentients such as ales, liquors, and wines, contained alcohol. Depending on its strength, an alcoholic drink could impart a burning impression in the mouth and digestive system. Excessive alcohol consumption caused temporary intoxication (or "drunkenness"), typically followed by unpleasant aftereffects. Although tolerance for alcohol varied between individuals, it was possible to train one's body to strengthen its resistance.