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.
Since cig smoke is commonly used to mask MJ then yes, smoking can interfere with his duty to detect drug usage. Also, it can be used to burn the cop so for officer safety he can order it out.
Again, as shown in the statutes provided, any order that does not directly contradict state/federal law or civil rights is deemed a lawful order according to State law. If you don’t like the law then change it, but otherwise you must follow the law.
Yes, he can, and you have no idea what you are talking about, and a lit cigarette can be used as a dangerous weapon.