Straight to comments , first thought as well. Second thought was , iinnant that juss too effin’ bad.
It is a poison gas of sorts, ie it’s noxious, harmful to inhale, makes you incapable of normal breathing, it is meant to have a negative physical effect. So you expect no aftereffects? Leaving even within an hour, tear gas is not “two breaths” out of your system.
These "protestors" are lucky to be living in America where this idiocy is tolerated and not resolved quickly by authorities with the very negative effects of acute lead poisoning.