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Smoker takes this easily for me. The only way Caesar could even hurt Smoker (since he doesn't seem to be using haki) is by taking away the air. Smoker already knows that attack though and he can attack on long range aswell.
He'll poison smoker
The main question is, does a Logia need to breath !!! The mini story with Enel show that he can live in space without air, so no !!!
So Smoker got Haki what Ceasar don't have, I'm not sure any Caesar attack could work on smoke logia.