Wasp-Repellent Coffee Repel wasps with coffee smoke The smoke generated in the fireproof clay bowl spreads a smoky coffee aroma through the holes in the lid. Wasps will avoid the smoke, which they find most unpleasant. The smoke generated in the fireproof clay bowl spreads a smoky coffee aroma through the holes in the lid. Wasps will avoid the smoke, which they find most unpleasant. Application: