SRD:Dust of Sneezing and Choking
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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.