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That really depends on what type of smoke your describing. Is it white, blue, black or is it smoke like boiling water? If it's like boiling water smoke then that is normal for early morning startups. If you see water comming out of your tail pipe that is normal too. If you here a little ticking and knocking noise when initially starting up and stops when the motor is somewhat warmed up, that is normal. Why did you change the oil at 350 miles? Most of the time, a brand new vehicle from dealerships usually use additives in your motor oil to help break the motor in properly.