Violation of puritan norms
It's a basic fact. Smoking improves the voice, until you reach the age when it ruins the voice. Singers and announcers have always smoked, and announcers were often
required to smoke.
The fact hasn't changed but puritanical idiocy forces us to ignore the fact ... until now.
BBC website has a feature about the actors who do dubbing and voice-overs for big names. The article includes pictures of 7 voice-over artists. Two of them are shown smoking, and the article makes no attempt to counteract the attractiveness of those pictures.
Later thought: The voice-over stars obviously posed with a cigarette and wanted the picture to appear for positive publicity. This tells us that producers who
hire voice-overs still understand the basic fact and still
want to hire smokers. Nice to know that common sense beats puritanism in some places.