If you see someone in your hunting party come down with serious case of AMS and get taken off mountain such he didn't get to corral until after dark for transport to clinic you get really sensitive to what it can do to you. Gasping for air, severe migraine type headache, nausea, and couldn't raise head off cot. And this came on fast overnight the first night at altitude. I will say he told us recovery at clinic was fast and the night life in Durango is quite good that week. He never elaborated on that. Guess AMS didn't have long term affects.