It's been cold here in Florida. Got below freezing for a few nights.  My Tbird was in my garage.  For some strange reason, the passenger side exhaust manifold has begun to burn off white smoke vapor when I first start it.  It doesn't smell like anything and the engine runs perfectly.  The smoke stops when the engine gets to operating temperature. I checked the oil and the coolant levels and they are fine. I can't see any coolant or oil leaks. Is this something I should worry about?  Could this be condensation?