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NFL issues ban on ammonia inhalers, smelling salts during games due to negative side effects
The league claims, among other things, that ammonia inhalers can potentially mask signs of a concussionwww.cbssports.com
Be interesting to see if this has any effect on quality of play.
I doubt it—you can get them from CVS…..church supply stores
Some have said that adverse effects are not widespread
Smelling salts - PMC

Frightening injury recently