To give credit where it's due, Anu did mention the use of muggle as a synonym for marijuana(though I'd never heard it before:

"With the fifth Harry Potter book out last weekend, the young wizard
continues his magic on children and adults alike. It's a sign of his
hold on popular culture that muggle, a word coined by the author of
the series, recently made it into the Oxford English Dictionary (OED).
To be precise, the word muggle has been a part of the dictionary for
a long time, even before Harry was born. The OED lists a number of
senses for this word (resembling a fish tail; a young woman; marijuana)
spanning the 13th to 20th century. But Harry Potter books gave a new
meaning to the term...."