This is a set of 4 new cards for Stoner Fluxx. Two are new Keepers (Hash and the Secret Stash) and two are Goals (Hash Pipe and Stash of Hash).
The Hash counts as Weed. The text on the Secret Stash reads as follows: "If you have this card on the table you may hide one Weed Keeper under this card and it’s just like it doesn’t exist. You can reveal it at any time, but you can only hide your Weed during your turn. If this card is lost or stolen, the Weed goes with it."
These cards were created to use as give-away at legalization festivals, encouraging attendees to collect all four to add to the game being sold at a vendor's table.