If it IS leaking anti freeze in to the combustion chambers it will have a "sweet" smell at the exaust,the liquid will also have a sweet taste on your tounge(Although I am not recommending doing so!!! :)
If it IS clearing up after running,I doubt anything is wrong other than condensation.
Like others said,check all your spark plugs after running it and leaving it set all night.THAT will tell you a story.Watch for coolant loss at the radiator as well.
I would STILL re torq gasket even if it all checks out ok just because it is a good idea.