First time running 5 miles!!!

I was not born to run. As a child my chest would get a sharp stabbing pain and I couldn't catch my breath when I ran less than a half lap around the track. In my teens I started smoking at which point I was really screwed. But I quit smoking a few years back and started working out more seriously the past year. I still would have never in a million years thought I could have run more than a mile without going into some kind of unoxyginated coma, a really sweaty one at that. But I did 5 miles today avg 10 min 28 seconds! I am tooting, nay, blasting my own horn today.