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Stimulant to get you fired up before you shit out your own intestines.
More actual info:
"Smelling salts are used to arouse consciousness because the release of ammonia (NH3) gas that accompanies their use irritates the membranes of the nose and lungs, and thereby triggers an inhalation reflex. This reflex alters the pattern of breathing, resulting in improved respiratory flow rates and possibly alertness."
Can a bro that lifts explain why you use smelling salts beforehand