Quote Originally Posted by rabernet View Post
CO2 is what you exhale every time you breath, it's not going to harm your snake.
Well, that's not exactly true. CO2 in large concentrations will mix readily with the water of the mucous membranes and produce carbonic acid which can be quite painful. That's why it's advisable to start off with low concentrations when using a CO2 chamber and increasing the concentration after the the rats/mice are unconscious.