Grenade, Smoke Grenade

A smoke grenade deals no damage; instead, it releases a cloud of dense smoke. Each character who inhales smoke must succeed at a Fortitude saving throw each round (DC = 15 + 1 per previous check) or spend that round choking and coughing; he can do nothing else. A character who chokes for 2 consecutive rounds takes 1d6 nonlethal damage. (Active environmental protection from a suit of armor prevents this effect altogether.) Regardless of the armor a character wears, smoke obscures vision, granting concealment to anyone within it.