I agree that narcosis can come on at any depth. My point was that I would consider it unusual at 26 m and if I was a new diver and it happened (as I believe the question was about) I would definately investigate further. If you are susceptable to narcosis at that depth I believe you need to know that. I also totally agree with the fact that it depends a lot on your physical/mental condition at the time of the dive, something that can vary considerably from day to day.