Eucalyptus trees, which are native to Australia, are now commonly found worldwide. The oil from the leaves is believed to have a range of medicinal uses. Eucalyptus oil is an ingredient in many over-the-counter cough suppressants and chest rubs. Australian aborigines also used its leaves as a first-aid for open wounds by creating a poultice and applying it to the skin. Its flavor is similar to mint, with a cooling, menthol-like quality.