My exhaust smokes

Admittedly, the title is deliberately stupid, but it’s true. My exhaust smoked today – after the engine was off… In turn. As today was such a bomb weather I put in an extra round. At a red traffic light an unknown smell pours into my nose. Oil, burnt rubber – something like that. Didn’t think about anything at first but at the next traffic light the same. Well. First of all, put your hand on the Vario cover. Normal temperature, all But then I see smoke rising from the exhaust. No thick mists but a little “steam”. Hand held about 10 cm away and it was good hot. Sometimes strongly spit on the exhaust and it brutzelt like in a hot pan. The ride was by the way without problems: normal driving behaviour/acceleration and normal engine noise. The only thing I did differently today was the route. It went down to about 3 km with 10%. Can that have something to do with it? Or Does anyone have any general theses here?