From the book The Botany of Desire:
Witches and sorcerers cultivated plants with the power to "cast spells"--in our vocabulary, "psychoactive" plants. Their potion recipes called for such things as datura, opium poppies, belladonna, hashish, fly-agaric mushrooms, and the skins of toads (which can contain DMT, a powerful hallucinogen). These ingredients would be combined in a hempseed-oil-based "flying ointment" that the witches would then administer vaginally using a special dildo. This was the "broomstick" by which these women were said to travel.Huh, didn't know that.