Thank you all for replies!
Doug, I like different types of backpacking. It’s just the feeling that I’m restricted to visit remote areas.
As I said the problem isn’t in high altitudes, it’s that I can’t go to remote areas, which are far away from civilization.
James, you are right, I’m very thin and young (hope that I won’t have this problem when I become 40 years old, but it’s painful to feel yourself restricted when you are in the most active ages of your life). However, I don’t smoke.
Elliott, unfortunately I live in the flat area, there are no even hills. And the nearest mountains are thousands miles away, and I can go to the mountains only two-three times a year.
Sean, that’s right, it’s what I’m doing right now.
Walter, I’ve already switched from climbing to backpacking through the valleys. Now one of the main reasons why I do that is photography. So I switched from conquering the mountains to taking photos of them. And like you I had problems with my lungs only cities, it seems that stressful life in a polluted city causes more damage to my lung than high altitudes. Thanks for PM, I checked the link but it’s what majority of doctors say, but they say that because they were told so when they studied. And actually there was no any research on how high altitudes can cause collapsed lung, it’s one of the assumptions.
In the former USSR there are really a lot of different mountains. Unfortunately, I’ve never been in Khan Tengri, but a friend of mine was there when he was climbing to Marble Wall – spectacular place. This summer I’m going to the Altay Mountains, they are near the border between Russia and Mongolia. They aren't so high as the mountains in Central Asia, but still beautiful, here some pictures of them: http://pohodnik.info/foto.php