I don't recall if there were smoking rooms but based on the quality property I doubt they have smoking rooms. They do have a smoking area in front of the hotel.
I believe all marriotts are smoke free but some rooms have balconies
I don't think so. Most hotels in US now seen to be smoke free.
Not that I am aware of.
Not sure if there are any smoking rooms, as the response from Liz indicates, but the floor plan of the property is a low rise, and there is a smoking area in front of the hotel, with several doors accessing the area close by. You may want to call the property and ask them. As an aside, I do not believe that any of the local area hotels have smoking rooms. At least the Marriott makes a smoking area easily accessible.
Get an answer from Denver Marriott West staff and past guests.