RE: I want to know the TRUTH about this...
I did some research on this for a while. Last year i shot a deer, i knew that i had made a good shot, but still i couldn't find it. About a week later my dad was hunting the same field when the deer i shot stepped out. He shot and killed it. Turns out that i had hit the deer in one lung and it had survived. I asked some of my biology professors and this is what they told me. Unlike humans, deer have a membrane that allows their lungs to work in unisome but yet independently. If we are shot in the one of our lungs, negative pressure makes our whole lungs deflate since they are connected. But a deer has a membrane that allows the other lung to continue to breathe. But it is a long shot. Usually it will bleed to death. But if you are just asking if one can live on only one lung. The answer is YES.
Ben