A lit cigarette is a potential danger to an officer’s safety.
If an officer doesn’t want a person who he is investigating to be next to him while holding a burning object, then he can order that person to extinguish the burning object, thus rendering it a threat no longer.
Sorry, BRAH, cops do this all the time.
He can tell her to put it down, I said that before. He can also tell her not to smoke while he is talking to him. Sure. But if she sets a lit cigarette onto the ashtray, he can’t then tell her to put it out. Her putting it out has nothing to do with the performance of a traffic stop.