This metal urn is identical to an efreeti bottle. It does nothing but smoke, however. 

The amount of smoke will be very great if the stopper is pulled out, pouring from the bottle and totally obscuring vision in a 50,000 cubic foot area in 1 round. The bottle, left unstoppered, will fill another 10,000 cubic feet of space with smoke each round until 120,000 cubic feet of space is fogged, and this area will continue to remain so smoked until the eversmoking bottle is stoppered. 

The bottle can only be resealed if a command word is known.