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The NFL sent a memo to teams Tuesday banning all forms of ammonia inhalants and smelling salts from games, pregame activities and halftime, following an FDA warning about their unproven safety and efficacy. The decision stems from concerns that these products, which have been ubiquitous on NFL sidelines for years, may obscure neurological symptoms that could indicate concussion.

What are smelling salts?

Smelling salts are chemical compounds, most commonly containing ammonium carbonate or a blend of ammonia, water and alcohol. When exposed to air, they release ammonia gas, which has a pungent, ac

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