After breathing the gas himself, Priestley wrote: "The feeling of it to my lungs was not sensibly different from that of common air, but I fancied that my breast felt peculiarly light and easy for some time afterwards."
Efter selv at have indåndet gassen skrev han: "Følelsen af den var for mine lunger ikke sanseligt anderledes end almindelig luft, men jeg syntes at mit bryst føltes særdeles let og nemt i noget tid efter."