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Unfortunately, Palos is probably right. White "smoke" is usually steam, you overheated and probably blew out the head gasket. However, a broken coolant hose can make a big cloud of steam and cause your engine to overheat and run rough without necessarily killing your head gasket. Check and see if your coolant is low, it could just be a broken hose.
Check for water in the oil (makes it look like cheez-whiz on the dipstick) and if you find it, you know you'll have to take off the head. Drain your oil immediately, before it causes your engine internals to rust. If there's not water in the oil (or not much) it's safe to turn the engine over for diagnostics. When the head gasket is blown, the exhaust smells sweet like antifreeze, and you'll have poor compression in one or more cylinders.
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