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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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A discovery I made during research is that while being poisonous to the central nervous system, methanol is a natural endogenous compound found in normal, healthy human individuals. One study found a mean of 4.5 ppm in the exhaled breath of the subjects. dx.doi.org/10.1088%2F0967-3334%2F27%2F7%2F007 – Gabriel Fair Nov 19 '15 at 3:31

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
    
Would these gases be extreated from the body in gasous form? – Gabriel Fair Jun 9 '15 at 22:21

H₂O is emitted through respiration and perspiration.

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