Smoke Trail Loop animation

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Smoke Trail Loop animation

First of i want to say i have little to now experience animating fx. and that this is being used for my final 3rd yr film. (animation student)

Im trying to figure out whats the best way to appoarch animating a looping animation of a smoke trail behind a runner.

Im not sure if the best way is to animate circle growing and rotating in side. Not have the greatest of luck here.

Plz can someone give me some helpful hints or tips on how to save myself time and a load of stress. :D