So after reading "Garleans In The Vale" in The Harbor Herald tonight I was wondering..
What lore does it give for adventurers to be able to survive within the Vale?
Is there some key item to enter that supposedly filters out the noxious gas?

"Besides scorching the flesh, the liquid also emits a noxious gas that renders breathing an exercise in agony when inhaled, an affliction known as Gold Lung."

"No living creature can survive being in the Vale for any length of time save those monstrosities that have evolved to thrive in the forsaken environment."

What prevents us from dying when we go in? Or is it just "Better hurry and get through here before we all die!!" O.o

I suppose SE doesn't HAVE to explain it.. but it makes no sense to me at the moment.
So I'm just curious. :x
If I were living in Eorzea I don't think I'd be heading in there any time soon.. no matter how great the reward.