When we were there in April, we stayed in Magnolia Terrace and it was Non-smoking which was important to us. But I think you can go to www.wdwig.com and they have all the building listed out.
Aligator Bayou Bldg 27 is non smoking
and less than a 5 mimute walk to main eatery and check in/out
we had a room facing the main path to the food court.
Was a very nice situated area to stay.
We were in building 14 which is the closest Alligator Bayou building to the food court and main building and it was non smoking - I think building 15 is non smoking also - Bldg. 18 is a smoking building! However - even if the building is non smoking - we had a "neighbor" who proceeded to smoke right outside of his door (and ours) at all hours - which did make our room smell a little bit - luckily he was gone after 2 days of our stay!