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Jatx,
What elevation are you use to?
How is your overall breathing?
Some people suffer from allergies to Pine trees. It may not effect your nasal passage but your sinus' maybe paritailly plugged....might want to check out clartin or some other OTC allergy drug.
As always drink lots of water and be careful of the sun at 12k.
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"This is the law: The purpose of fighting is to win. There is no possible victory in defense. The sword is more important than the shield and skill is more important than either. The final weapon is the brain. All else is supplemental." - John Steinbeck, "The Law"
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