Method Is inhaling canned air effective for causing unconsciousness?

[Grimpoteuthis]

I am thinking of combining this with partial or full suspension, but I don't want to cause myself brain or organ damages in case I fail. Huffing canned air used to be popular among teenagers to get high and there were reports where people died accidentally through this, but the death rate is low enough for me to not rely solely on it. So my question is, how effective is it for causing complete unconsciousness? Thanks in advance.