If it hadn't been driven for a while or only done small trips it could be a build up of condensation in the exhaust, mine, a 3.0tdi had the same issue when I got it back after a test drive, one way is to cup the White smoke and pull it towards your face and have a sniff, if it doesn't smell chemically or fuellie then it should be fine, a good blast getting the exhaust nice and hot usually sorts the problem of condensation, I do a lot of 2 hour motorway journeys and mine disappeared within a couple of days, it'll still puff out a bit of condensation when cold but will be clear once upto temp.
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