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If you're referring to the smoke coming off the wing tips of aircraft that would be a wing tip vortex which is what occurs from the induced drag created by the wings of the aircraft as it creates lift. the smoke that comes from the exhausts of the jet turbines is not actually smoke but water vapor called con trails. the higher temperature water vapor from the exhaust mixes with the cooler temperature air outside of the exhaust and causes the water to condense making the con trails as the aircraft travels through the air.

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12y ago

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