That shop manual is priceless for the 210-250 line. Small little things all over the saw that need attention. Smoke is most likely due to a dull chain if the oiler is oiling. Unless you are using an 18 inch .325 bar and chain, then sometimes it will not have enough oil. Make sure that the pump is not caked up with sawdust, and that the oil line filter is not clogged up as well. The oil line filter can be gotten to from the oil cap, but it is easier from under the saw.
You can pull the oil pump, but it is a PITA. Have to remove the wrap to get to the pump elbow from below the saw. Remove the elbow, one side is to the oil line and the other is to the pump seated in the saw. The oil line and filter can be pulled out from under the saw and cleaned. I forget the size thread of the pump, but the pump is threaded on the bottom. Pay a lot of a Stihl specialty oil pump removal tool, or... screw a bolt into it and pull it out with a pair of vice grips levered over a flat screwdriver. There is a small hole in the pump to clean out, and while it is out give the pump a blast with compressed air, and the pump area a blast as well to remove any fine sawdust. The pump pushes pretty easy back into the hole, but the height is hard to get right from the bottom. For that, pull the sprocket and clutch, and set the oil pump gear head until it is centered on the oil pump drive gear. I did this on my 210 when it was not oiling, and it works fine now.