Uncivilized behaviour from runners such as open defecation, smoking, or trampling on flower beds or green spaces that affect the race and the safety of other runners will result in disqualification.
Does "open defecation" really happen often enough during races that it necessitates having its own rule? What exactly goes on during these races???
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.
I'd figure after the first time they'd want to ensure there's no repeats. Like when you go to a store and it has, "No humping the mannequins", and you just know at some point some Air Bud motherfucker was like, "Theres no rule against it!"
I worked with a guy in the 1990s who smoked like a chimney and was a serious cyclist. He did the "Ride across Saskatchewan" a few times, placing quite well while smoking a pack of cigarettes along the way. Madness and he said half the fun was how much it pissed everyone off to get passed by someone sucking on a cigarette.