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Listen Check:1d20+13
Fort Save for a round in the smoke: DC 15, using mind over body for a concentration check instead of fort save (1d20+13)[29]

If you fail the save (which increases by 1 for every round in the smoke) then you spend the round choking and coughing (no other actions). Fail twice in a row and take 1d6 nonlethal damage (should be enough to drop the man).