I think it does actually. There are a handful of stories of runners pulling the side of their shorts open and dropping a log, I’ve even seen a video of it somewhere.

I disagree that smoking is anywhere on the same level, though. However, I suppose it can make it harder for other runners around them.

Edit: a quick search auto filled for me, apparently it happened just last year at the Boston marathon: https://www.runnersworld.com/news/a43646468/boston-runner-takes-a-pit-stop-in-yard/ I’m sure it’s happened many other times also, but that story is kind of drowning out any other links.