I am just now today experiencing this exact thing for the first time! The so-called "addiction" is strong too—I just did a long run on Sunday and am sore and tired and am already looking forward to my next run. I'm a new runner, and thinking about it, I am drawn to it more for the alone time + weight loss than I am the actual running (which is tough for sure). Thanks for the post—it was fun to read and think about.