Abingdonboy
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Looks like exhaust. Can't see anything below wings to emit smoke...
The smoke is coming from the engines not under-wing smoke generators- this isn't a display a/c just a regular MKI. This isn't exhaust but smoke for display purposes. This is possible to do with certain fighters, engines and engine management systems.
MKIs don't emit anywhere near that amount of exhaust trails:
The smoke here is white as opposed to exhaust that is characteristically black in colour. I'm no expert on such matters but I believe such smoke/mist trails can be caused by feeding more aviation fuel into the engine so that is heated, evaporates, mixes with the cool air outside the engine and turns to mist- but I could be wrong on this front.