Dust of Sneezing and Choking
Wondrous item, uncommon · 2014 rules, SRD 5.1
Looks like dust of disappearance. When thrown, creatures within 30 ft make a DC 15 Con save or can't breathe and are incapacitated for 1 minute (save each turn).
Also in the 2024 rules (SRD 5.2).