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There's always one of these threads every winter. It's more than likely going to be water vapour out the exhaust. When cold, water is a bi-product of combustion, hence the "smoke"
Reason for me doing a search now on "exhaust"+"smoke"
I'd been driving about 15mins, 15 miles on Sunday, got to a roundabout floored it and there was a mass of exhaust cloud behind me - and it was the back screen that completely fogged up, it was def steam/condensation of some kind as it cleared off the screen very quickly.
Didnt do it on the way back though.
I was nervously planning on checking the oil filler cap tomorrow!
Sounds like a normal thing by the amount of other posts in other threads.