Absinthe is a high-proof, anise-flavored spirit distilled with wormwood (Artemisia absinthium) along with botanicals such as fennel and other aromatic herbs, typically bottled between 45 and 74% alcohol by volume. It originated in Switzerland in the late 18th century and became closely associated with Parisian cafe culture in the 19th century, where it was drunk as an aperitif. Concerns about thujone, a compound in wormwood, led many countries to ban absinthe in the early 20th century; modern producers control thujone levels, and the spirit is now legal and produced in Switzerland, France, the Czech Republic, and elsewhere. Its bittersweet, licorice-like flavor and vivid green color, which turns cloudy when water is added (the "louche" effect), make it a key ingredient in cocktails such as the Sazerac and the Corpse Reviver No. 2.