[mmcpeck]

White smoke at cold start up is normal, as your running a rich mixture and therefore there is a lot of extra moisture in the exhaust, H2O is a bi-product of burning a carbon based fuel. This is why exhaust systems rot out from the inside when you do short trips and the water doesn't heat out of the exhaust pipes.

But anyway, once the engine warms up and you are running a leaner or stiochiometric mixture, most if not all of you white smoke should go away. That is of course unless you are burning water(coolant), in which case you will have a constant white smoke because the water never goes away, such as a head gasket problem.

If that's the case you will see your oil diluted with coolant and vice versa, look in your radiator cap and see if your coolant looks oily, but I think you mentioned that none of this is happening.

Are you losing coolant at all?

As was mentioned you could be seeing some oil burning on start up from valve guide seals, they dry out around the valve guides and until they get a little heat, oil in the head will fall right down them and into the combustion chamber. It's not all that uncommon and not that big of a deal, you could go forvever like that.

If it's constantly burning oil (blue smoke) then you could have ring problems and that could be an issue. But if it's just on startup, I wouldn't worry about it. Get some Auto RX and do a cycle through it, it will clean things up and may even help seal up the valve guide seals.