Greywhite smoke coming out of taipipe - 2000 Saturn SL

Black smoke = rich mixture
Blue smoke = oil
White smoke = steam

You only see in the the winter. Gasoline contains water at molecular level and come out of the tailpipe as steam when it burns under combustion.

White smoke from the tail pipe is moisture/water turned to steam.It comes from the air drawn into the engine and/or coolant in the engine.If you see excessive white smoke and your coolant level is dropping,you are most likely steaming coolant.Oil burning usually comes out as blue smoke.

Smoke - Joseph Auto Service

www.josephautoservice.com/faq_smoke.html
Description of problem: You notice a grayish smoke coming from the exhaust when you start your ... However, if the smoke continues after the engine is warmed up, there is a problem. ... Do not look for the problem while the fire is still burning.
images for fire & smoke coming up the exhaust

Where is the smoke coming from? I mean, is it on the outside of the engine...smoke coming out of the tailpipe (exhaust pipe)...on one side of the engine?

smoke is coming up from where its really kinda hard to tell you what to check and how to do it if the right information is not there like year make and model with a engine size and where the smoke looks to be coming from but i will give you a few things to go off of. if the smoke is coming from where the air clearner is then you may have bent or stuck open valves or some kid may have jammed something up the tail pipe. now if the smoke is coming from somewhere esle you may have a electrical problem.

WHAT COLOR IS SMOKE IF ITS WHITE YOU HAVE BLOWN HEAD GASKET IF YOU SEE WHITE STEAM SMOKE UNDER HOOD OR WHITE SMOKE COMING OUT THE EXHAUST PIPE.

do u see blue smoke come out the taipipe! if so injector o rings

Have some one scan your car for diagnostic trouble codes. There is an emmision control fault that should be taken care of or it could lead to further problems. The fluid coming out of the tailpipe is normal. Gasoline has a certain percentage of water in it and what doesn't get evaporated comes out the taipipe.

Are you sure it's smoke? Probably not smoke, the coils are freezing up and the air is so cold it condenses and looks like smoke coming out.