In the episode The Battle of Bardon Pass of the TV show Camelot, Morgan Pendragon is shown smoking a pipe:
What is she smoking? Since the show is taking place in Post-Roman Britain, it can't be tobacco (which comes from the Americas).
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It can be a historical inaccuracy, but I found information on 'History of Smoking' Wikipedia page that cannabis and some other things were used in Ancient Greece.
In Ancient Greece, smoke was used as healing practice and the Oracle of Delphi made prophecies while intoxicated by inhaling natural gases from a natural bore hole. The Greek historian Herodotos also wrote that the Scythians used cannabis for ritual mourning purposes and, to some degree, pleasure. He describes how Scythians burned hemp seed (IV, 75)