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Bear spray is a specific aerosol spray bear deterrent, whose active ingredients are highly irritant capsaicin and related capsaicinoids, that is used to deter aggressive or charging bears.[1][2]

A bear spray dispenser
What does bear spray do?
It inflames the eyes and upper respiratory system. If used properly, it can effectively deter an aggressive bear. ► TREAT BEAR SPRAY LIKE A FIREARM. Contents are under pressure: Spray comes out at more than 70 mph and could cause permanent eye damage