[abrittis]

Thanks all for the replies. It turns out that after driving it for about 15 minutes straight, the smoke cleared and the problem never appeared again. I'm assuming I have a minor coolant leak somewhere that allows coolant to enter the combustion chamber. If left sitting unstarted for a few weeks allowed enough build-up to cause the smoke. I like Triznox suggestion (because it's cheap :-)) and it's something I will look into.