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Cost is a factor. Other then empirical evidence of "feeling better" or what seems common sense that you are "adding conservatism" has there ever been a case study that concluded it was in fact safer? IOW a lower incidence of DCS?
My training said the answer was no. Is that no longer true?
Sure, it doesn't hurt... but can you prove it helps? My training 12 years ago said the answer was no. Has this changed?
Empirical evidence? No. Anecdotal? When I ran in the Flower Gardens, we sold nitrox for an additional $65 for a charter, or something like that. What I noticed was that with we sent about 8 divers per year to the chamber. I also noticed that with a single exception, every one of those divers were on air. Fast forward to when I chose to include nitrox in the charter price. Suddenly, everyone was on nitrox. Those few holdouts are offered a "discover nitrox class", in which all aspects of the nitrox course are taught, but a card is not issued, nor does any money change hands. Since I created that policy, I can count fewer than 10 customers who still chose to dive air, for their various reasons. I can count fewer still the number of bends cases we've had since then. That would be 2, both divers buried in deco on trimix rebreathers, which doesn't really count.
So, for recreational diving we've dropped our number of bends cases from 8 per year to zero since 2008. I'd call that pretty good anecdotal evidence.