other appropriately physiologically active gas or vapor in or around a facial orifice such as the mouth or nostril while substantially inhibiting the flow of the co 2 into the trachea and lungs by limiting inhalation of the co 2 if the mouth is infused the gas is allowed to exit from the nostrils alternatively one or both nostrils may be infused either by using the dispenser head shown in fig3 b or by use of a cup or similar device that covers both nostrils as shown in fig3 e the gas is allowed to flow from a remaining open orifice i e either the mouth the uninfused nostril or both as appropriate completely holding the breath is not necessary to substantially prevent inhalation of the co 2 with practice it is possible for the individual to breathe through an uninfused orifice for example if one nostril is infused and the gas is allowed to exit though the other nostril it is possible for the individual to breathe through the mouth without substantial inhalation of the infused gas the eye or eyes may also be infused using a cup as shown in fig3 c or merely by holding a hand over the eye and releasing the gas between the hand and the eye persons of ordinary skill in the art will appreciate that a.