Why is ether no longer used as an anesthetic?
Not safe and not as easy as the new stuff that's come out.
American military doctors began using ether as an anesthetic on the battlefield during the Mexican-American War (1846-1848), and by 1849 it was officially issued by the U.S. Army.
Usage of ether and chloroform later declined after the development of safer, more effective inhalation anesthetics, and they are no longer used in surgery today. Chloroform in particular came under attack in the 20th century, and was shown to be carcinogenic by ingestion in laboratory mice and rats.
It is now used mainly in the preparation of fluorocarbons, used in aerosol propellants and refrigerants; it is also found in some cough and cold medicines, dental products (including toothpaste and mouthwashes), topical liniments and other products.