Q: What could be causing white smoke

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The last few weeks my car has been letting of quite alot of white smoke from the exhaust, more than normal considering it's been very cold lately. About a month ago I noticed the thermostat housing was leaking so I've replaced that and the doesn't seem to be any visible water leak now. The engine doesn't ever overheat the oil is nice and clean Nd clear the water tank is clean Nd clear. So what could be going on?

My car has 103000 miles.
My car has a manual transmission.

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