I did a bit of research and came up with this:
I have a 225g can of Bear Pause, contents 0.98% Capsaicin;
I have a 22 g can of Black Max Dog Repellent , contents 5% Oleoresin Capsicum (OC) & 0.5% Capsaicin
Fox Labs International web site states: 2% OC & 5% OC
According to Wikipedia, the free encyclopedia
web page the Scoville rating for Capsaicin can be as high as 16 000 000
whereas for OC it will reach 5 300 000
So the bear spray would indeed be very nasty if used on a human.
“In large quantities, capsaicin can be a lethal poison. Symptoms of overdose include difficulty breathing, blue skin, and convulsions.” Wikipedia It is not clear however if this can occur from inhalation .