It's pretty widely known by now that one of the smells in the special rub-and-sniff Harley Quinn Annual #1 is of a less-than-legal, but incredibly distinctive, drug. As a result -- even at New York Comic Con 2014 -- there have been many jokes about the results of rubbing and smelling the marijuana-scented section of the comic.

Hilariously, through its MAD Magazine website, DC Comics has released an "important message from the DC Comics department of ethical reading," which continues the running gag of the drug's distinctive smell -- "something called Cannibisylocibe 7-A" -- and the possible side effects.

The distinctive smell of the comic will not be available outside of the United States; the scent will instead be "fresh-cut lawn clippings," unless, as DC's ad says, you "know a guy."

Harley Quinn Annual #1, by Jimmy Palmiotti, Amanda Conner and a host of artists, goes on sale Oct. 29.