SRD:Dust of Sneezing and Choking

Dust of Sneezing and Choking: This fine dust appears to be ''dust of appearance. ''If cast into the air, it causes those within a 20- foot spread to fall into fits of sneezing and coughing. Those failing a DC 15 Fortitude save take 2d6 points of Constitution damage immediately. In addition, those failing a second DC 15 Fortitude save 1 minute later are dealt 1d6 points of Constitution damage. Those who succeed on either saving throw are nonetheless disabled by choking (treat as stunned) for 5d4 rounds.

Faint conjuration; CL 7th; Craft Wondrous Item, poison; Price 2,400 gp.