From Pathfinder #176: Lost Mammoth Valley, which isn't enabled.

Smoke Screen Snare (Lesser)

ITEM 1

UNCOMMON CONSUMABLE MECHANICAL SNARE TRAP

Price 3 gp

Usage held in 1 hand

Bulk —

Category snare

You create a snare that releases a dense cloud of smoke when a creature enters the square, filling a specified area. All creatures within that area are Concealed, and all other creatures are concealed to them. The smoke lasts for 1 minute or until dispersed by a strong wind.

The smoke fills the snare's square and all adjacent squares.

Craft Requirements Supply a Lesser Smokestick.

Pathfinder #176: Lost Mammoth ValleyOGL