Overview

• A memo sent Tuesday prohibits all ammonia inhalants during pregame, on-field, halftime and locker-room activities.
• The ban follows a recommendation by the NFL Head, Neck and Spine Committee based on an FDA notice about safety risks.
• 49ers tight end George Kittle crashed an NFL Network broadcast to announce the rule and said he considered retirement over the change.
• Players are evaluating how the prohibition will affect sideline routines and may seek dialogue on possible accommodations.
• Smelling salts have long been used for an alertness boost despite unproven benefits and are already banned in boxing for masking concussion signs.