What are Smelling Salts and How Do They Work?

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In this video:

Smelling salts have been used for everything, from reviving those who have fainted to athletes needing a chemically-induced “wake up.” But what are smelling salts? Are they actually an effective medical treatment? How do they work? Are they toxic and dangerous?

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Sources:

http://en.wikipedia.org/wiki/Smelling...
http://www.mnn.com/health/fitness-wel...
http://www.webmd.com/brain/understand...
http://www.atsdr.cdc.gov/tfacts126.pdf
http://bjsm.bmj.com/content/40/8/659....
http://www.scifun.org/chemweek/PDF/Am...
http://www.psmag.com/culture/what-do-...
http://io9.com/5856832/how-do-smellin...
http://en.wikipedia.org/wiki/Ammonium...
http://www.theodora.com/encyclopedia/...
http://en.wikipedia.org/wiki/Sal_ammo...
http://jacksonville.com/tu-online/sto...