basically not in any public space, with rare exception.

There are still hotels with 'smoking' rooms in I think South Carolina and Kentucky at least, you definitely want to make sure you have a non-smoking room or you'll be inhaling musty old tobacco smells the entire night, something I had made the mistake of once.

Laws vary state to state. I walked into a bar in rural Pennsylvania that had ash trays on the bar and the odor hit me in the face as soon as I walked in the door. Don't miss that one bit. Someone told me it's still legal in places that don't serve food