Althought it is mentioned in the topic of the article, I must emphasize more the fact that these test were done with mice. Also the toxicity of H2S should have been mentioned when posting this kind of links to forums IMHO, if this kind things need to be posted here.
The concept is really something that nobody should ever even imagine to try in real life.
Human can smell (detect) the H2S in about concentration of 5 ppb = 0.005 ppm and one get used to that concentration pretty quickly (doesn't detect it anymore) and that is when it becomes real danger.
Tests were done with 80 ppm, whereas the limit for concentarion that are
Immediately Dangerous to Life or Health (IDLH, meaning irreversible damages) is 100 ppm / 30 min.
http://www.airgas.com/documents/pdf/001029.pdf