Hilton Garden Inn Elko, NV (they have a few smoking rooms) once did something odd when I reserved a 1 King; before the booking finalized a box popped up that said they could not confirm my smoking preferences and do I wish to continue with the booking. My profile is clearly set to non-smoking preference. I continued but the booking did not show if it was a smoking room or non-smoking room. I got to the property and I was allocated into a room that seemed to be non-smoking but right next to the few smoking rooms at the end of the hall on the top floor. I was not happy, but was told they were full and there was no relocation option. I communicated my dissatisfaction, and felt the manager made it right. The next time I stayed there which was almost a year later I was not placed anywhere near those smoking rooms.
This is one good thing about Marriott in the US- 100% non smoking properties.