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Other than CO2 and Methane what other gases do humans produce or emit?

For example, does skin decomposition, or aerobic respiration emit any special gases that people don't normally realize or know about.

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The gases NO, H2S, CO even have a function in the human body!

Nitric oxide is produced in endothel and neurons as messenger, and in macrophages as cause of nitrosative stress for imprisoned bacteria. Hydrogen sulfide is produced in cysteine catabolism and functions as messenger (only recently discovered). Carbon monoxide appears to act as messenger, too.

http://en.wikipedia.org/wiki/Biological_functions_of_nitric_oxide

http://en.wikipedia.org/wiki/Hydrogen_sulfide#Function_in_the_body

Wu, L; Wang, R (December 2005). "Carbon Monoxide: Endogenous Production, Physiological Functions, and Pharmacological Applications". Pharmacol Rev 57 (4): 585–630. doi:10.1124/pr.57.4.3. PMID 16382109

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I always understood that NO, when used as a neurotransmitter / second messenger, is in solution, i.e. not gaseous. –  Konrad Rudolph Aug 15 '12 at 21:01
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H2O is emitted through respiration and perspiration.

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In addition to the comment above, nitric oxide main function is to cause erection in male sexual part. Nitric oxide causes blood to be clotted in soft tissue of penis.

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Clotting does not occur in that situation, please check a reliable source and update your answer. –  jonsca Oct 6 '12 at 23:35
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