At the height of this popularity, absinthe was portrayed as a dangerously addictive, psychoactive drug; the chemical thujone was blamed for most of its deleterious effects. By 1915 it was banned in a number of European countries and the United States. Even though it was vilified, there is no evidence showing it to be any more dangerous than ordinary alcohol although few modern medical studies have been conducted to test this. A modern absinthe revival began in the 1990s, as countries in the European Union began to reauthorize its manufacture and sale.