Sgisela I was initially going to say ‘smoke,’ as I had in mind a certain piano that had an ash tray built into a cheek block!
It is interesting seeing some older pictures or videos where musicians were smoking. I think of a Bill Evans photo where he's got a cigarette hanging out one side of his mouth. I think of several videos I've seen of Frank Sinatra workin' on a cigarette as he's performing on stage. And there are others.
Can't lie, sometimes the raspy tone of some of those smokers is kinda appealing to some of us who don't smoke and don't have that "edge" to our voices. But I'm still not gonna take up smoking.
Oh, and I almost forgot... there are the Oscar Peterson types... I don't know if Oscar ever smoked, I didn't think he did, but he always had his towel perched somewhere on the piano and would grab it and wipe the sweat off his head, didn't matter if it was in the middle of a song or not, the other hand just kept on playing and most people would never know the difference. LOL!