Why Do Witches Ride Brooms?

 So why do the brooms fit into this? Because to achieve their hallucinations, these early drug users needed a distribution method that was a little more complicated than simple ingestion. When consumed, those old-school hallucinogens could cause assorted unpleasantnesses—including nausea, vomiting, and skin irritation. What people realized, though, was that absorbing them through the skin could lead to hallucinations that arrived without the unsavory side effects. And the most receptive areas of the body for that absorption were the sweat glands of the armpits ... and the mucus membranes of the genitals.

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 Why Do Witches Ride Brooms? (NSFW) - Megan Garber - The Atlantic: