White smoke sometimes at idle at red lights but goes away

Engine runs fine, doesen't seem to smoke once I take off

White smoke either water or Gas not oil its Black or Blue

One of the main causes of white exhaust smoke and coolant loss is a
cracked or warped cylinder head, a cracked engine block, or head gasket
failure. A cracked head may allow coolant to leak
into one or more cylinders. An internal coolant leak can also contaminate the engine oil giving it a frothy, milky appearance.

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