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WHAT ARE AMMONIA INHALANTS (SMELLING SALTS)?
Historically, smelling salts have been used on people feeling faint, or who have fainted. Smelling salts are often used on athletes (particularly boxers) who have been dazed or knocked unconscious to restore consciousness and mental alertness. Smelling salts are now banned in most boxing competitions, but are not harmful.
They are also used as a form of stimulant in athletic competitions (such as powerlifting, strongman and ice hockey) to "wake up" competitors to perform better. In 2005, Michael Strahan estimated that 70–80% of NFL players were using smelling salts as stimulants
Smelling salts have been used since Roman times a evidence exists of use in the 13th century by alchemists as sal ammoniac. In the 17th century, the distillation of an ammonia solution from shavings of harts' (deer) horns and hooves led to the alternative name for smelling salts as spirit or salt of hartshorn.
They were widely used in Victorian Britain to revive fainting women, and in some areas constables would carry a container of them for the purpose. During this time, smelling salts were commonly dissolved with perfume in vinegar or alcohol and soaked onto a sponge, which was then carried on the person in a decorative container called a vinaigrette.
The use of smelling salts was widely recommended during the Second World War, with all workplaces advised by the British Red Cross and St. John Ambulance to keep smelling salts in their first aid boxes.
WHAT DO THEY DO?
Smelling salts release ammonia (NH3) gas, which triggers an inhalation reflex (that is, causes the muscles that control breathing to work faster) by irritating the mucous membranes of the nose and lungs.
Fainting can be caused by excessive parasympathetic and vagal activity that slows the heart and decreases perfusion of the brain. The sympathetic irritant effect is exploited to counteract these vagal parasympathetic effects and thereby reverse the faint.
WHAT ARE THE RISKS?
Since smelling salts produce only a small amount of ammonia gas, no adverse health problems from their situational use have been reported. If a high concentration of ammonia is inhaled too close to the nostril, it might burn the nasal or oral mucosa.
The use of ammonia smelling salts to revive people injured during sport is not recommended because it may inhibit or delay a proper and thorough neurological assessment by a healthcare professional, such as after concussions when hospitalization may be advisable, and some governing bodies recommend specifically against it. The irritant nature of smelling salts means that they can exacerbate any pre-existing cervical spine injury by causing reflex withdrawal away from them.
WHAT ARE THEY MADE FROM?