Mr. Bob, try going into your Aircraft CFG File,,, and scroll down to the words
[smoke]
then look for the entries and totally delete that entry.
but - leave the [Smoke]
then substitute add on smoke files for your particular aircraft, by adding the Add On' entry you found and chose below the [smoke] entry in the Aircraft CFG File.
you can probably find what you need right here on Simviation for about any aircraft, maybe

?
Jetranger