the slight Smoking in Cold Weather is Normal; its the Result of Hot Exhaust Gas hitting the MUCH Colder Air. you should only be concerned if the Smoke is Thick and White (and has a sweet Maple syrup type smell to it, meaning you are Burning coolant in the Combustion chamber) Blue (Engine Oil is getting past the Valve Seals or Piston Rings and once again, is Getting Burned in the Combustion Chamber), or Black (your Using fuel at a rate where not enough is getting burned in the Combustion Chamber, signalling a problem with either the Fuel Injection System or the System that Controls the Fuel Injection System)