There is moisture in the air that is used by the engine, and a little bit of moisture is okay.....as long as it is only noticeable when the engine is cold and just starting. Once the vehicle is up to operating temperature, you should not 'see' and moisture dripping, as it should have all turned to steam and evaporated.
If you are getting white smoke when running, it's an indicator of potential head gasket problems where coolant is being sucked into the cylinder and burned....a major problem.
But typically as Moo indicates, a little moisture and dripping from exhaust pipe when first starting, is normal. Based upon the area of the country you are in (and relative humidity), can change your symptoms.