Hey, you were truly lucky. My lung completely collapsed, then 3 weeks later collapsed again. My lung isn't even at 50%,. This happened April 2016. I see my lung dr every week, had 2nd opinion n was told same thing, I'm in that 3% bracket of people whose lung doesn't inflate to normal. I as of now, can night fly. Be thankful you were so lucky. I'm young, not much of a smoker, and was in good health.