When it is breathed under pressure, nitrogen has an intoxicating effect.
The effect will be experienced by all divers breathing air at depth in excess of 30 meters (100ft), although some divers may notice the effect at shallower depths.
It increases with depth, but it is quickly reversed on ascent but if the symptoms persist after the ascent to the surface, the cause is something other than narcosis.
Factors that increase a scuba divers likelihood of suffering Nitrogen Narcosis include;
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