Not even the NFL can get between San Francisco 49ers star George Kittle and his smelling salts. Just one day after the tight end joked he "considered retirement" and called for a "middle ground," in response to the league banning smelling salts and ammonia inhalants,

The star tight end joked about his previous usage of the now-banned ammonia inhalants, saying he used them before "every drive"

The NFL has banned the use of smelling salts during games, citing an FDA warning concerning the safety of the substance. Here's what experts say about the effects and the risks.