In article ,
Dylan Smith wrote:

On 2006-05-10, john smith wrote:
In article ,
Dylan Smith wrote:

Personally, I also need humidity -
my lips dry out horribly if I spend more than 4 or 5 days in the dryer
parts of the US

Chapped lips are the result of dehydration, not humidity.

I must have been dehydrating fast then. I drank what seemed like gallons
of water all the time, and pretty much always had a water bottle handy.

Does this senario fit the bill...
You flew on an airliner from Europe for at least eight hours prior to
arriving in the dryer climes. During that time on the aircraft you drank
less than one liter per hour of water. Hence you arrived dehydrated and
the chapping had already begun. It then takes several days of good
hydration for your lips to recover.