I had some new brake shoes from a good vendor installed when I got mine on the road. Probably not a problem now, and for you, but, it is apparently not uncommon to see smoke off of new brake shoes. I got on the road during June and was descending from 10,000'+ to 7,000' within a 17-mile-stretch and was kinda embarrassed to be on the side of the road, next to the ranger station, smoking like that. Sometimes my drum brakes squeak and it is like a very faint memory of a sound that was probably common when I was a kid, as there were probably more drum brakes up front on the road. The front ones produce tons of dust, be sure any leaking knuckle oil doesn't make its way to the backing plate and the drum.