if it's smoke machine white then thats cooland burning. There are many things that can lead to coolant burning but a poped headgasket is generally the most common. The easiest way to detect is to do a compression test, tho that doesn't always uncover the problem.
Pull out your plugs and look at them to see if any are 'wet' with coolant. Coolant is a sealed system so it shouldn't go anywhere, is yours low?
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