I only have two 3-rail steam engines w/smoke: A 2055 and a 2065. Neither are robust smokers.
However, I do like the aroma of the Mega-Smoke "Smoke Pellet" oil. I was never around Lionel's w/smoke pellets as a kid, so I wanted to see what all the hub-bub about the smoke pellet smell was about. Tried it, liked it. Now I understand!