Absinthe! - Henri Privat-Livemont
According to the Absinthe Poster site (crikey, you can find anything on the internet), "the height of the absinthe boom in the late 19th century coincided with the rise of the large lithographic advertising
poster as a powerful commercial and artistic medium," and with the rise of Art Nouveau.
Lucky us, to enjoy such confections as these, by Belgian 'poster artist' Henri Privat-Livemont -- from 1894, the height of La Belle Epoque.