I would take it back to the dealer where you bought it, either that or video record the smoke when you are seeing it and take it to them as proof. Sometimes customers think a car is smoking when they start the car in the morning and see smoke. This is usually condensation/steam. That is normal if it goes away after a few miles or so.
If it's doing it when it's warmed up there is a problem. V6 Toyota's especailly the 3.0 engine had head gasket problems so I'd suspect that and have them check the cooling system for HC. Either that or perform a leakdown test.
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