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Yeah your burning coolant which causes the exhaust smoke to be a white-ish color. How many miles and what year is your Neon? Opposed to what was said above, unlike pre-99 1st Gens, the 2nd Gen Neon never had a head gasket problem.
you should replace it ASAP so u dont warp a head...white smoke 99% of the time = head gasket...dont drive the car anymore. get it done..could save u a hell of a lot of money in the long run. if u keep driving it and warp a head tack on at MINIMUM another $350 on top of what the head gasket alone would cost you.