In this country during 1950s the famed stock car racer Smokey Yunick rediscovered nitrous oxide injection as one of his many methods for winning races until discovered and outlawed by NASCAR. Nevertheless, there have been several nitrous oxide cheating scandals in NASCAR over the years and it is probably still used today by the slowest of back markers. In the late-70s and early-80s nitrous oxide was rediscovered by drag racers and hot rod racers.
Today nitrous oxide injection, like many other modifications such as more aggressive camshafts, bigger carburetors, and higher compression ratios, more free flowing intake and exhaust systems, can be a practical way to more horsepower. Like any other modification, perhaps even more so because it so easily lends itself to misuse, there can be a reliabity and durability price to pay.
Nitrous oxide is a colorless, non-flammable gas. It has a slightly sweet taste and odor. It is non-toxic and non-irritating and when inhaled in small quantities can produce mild hysteria and giggling or laughter. This is were the nickname laughing gas comes form. When inhaled in pure form it will cause death by asphyxiation because at atmospheric temperatures and pressure, the oxygen in nitrous oxide is not available to the body.