For you library hipsters, or others with an unhealthy interest in the Harry Potter stories (unhealthy, meaning in this context that you’re over 12), an early appearance of the term “muggles.”
“Muggles” was 1930s slang for marijuana (see a contemporary Time magazine article here). I don’t believe I ever saw the connection made to the term as used by J.K. Rowling. Check out this Cornell catalog entry for more information….