@Australian(View Post) You do know there's an EDIT button on the right-hand side of your post if you put your mouse on it >:/ @Australian(View Post) CO2 doesn't kill. What you might mean is that if there's not enough oxygen in the gas mixture you breathe in every moment(if it has been mostly replaced by another gas) you lose consciousness.
as i have just looked up, you can die from carbon dioxide as it does not allow oxygen to pass through your body, the element that all humans need to breathe to survive