[scuba g]

A question I notice on some forums when you are putting information in about yourself and in quite alot of responces, Never. Since narcosis occurs to some small extent at any depth, but doesn't become noticeable until deeper depths, (commonly 30m to 40m range), why do divers still say they have never been narked? I can understand that some may say "I have never felt it" but the thing is in most cases you dont realise you have been affected by it! So just seeing what other divers views or on this.