Breathing Nitrogen at the surface has no influence on the body, however, that changes when breathing it under pressure. At a depth of 30 meters/100 feet, nitrogen has a noticeable intoxicating effect, which is increasing if you go deeper. Generally speaking, Nitrogen Narcosis has similar effects as alcohol and does affect each individual different.
The Narcosis impairs the diver's coordination, judgment and reaction and can be crucial as it may create a false sense of security and can lead to foolish behavior. Th narcosis can also work the other way around for some divers and make them feel uncomfortable or anxious, which can lead to poor decisions and even panic. The Narcosis affects also the same individual different from day to day, depending on the divers personal fitness, health or if he takes any kind of medicine.
Under the influence of drugs or rest-alcohol, nitrogen narcosis can occur in shallower depth (hence the rule not to dive under the influence of drugs or alcohol). ... more.
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