Blue smoke strongly means that it is coming from the turbo. Take it off check it out, then asses what to do next.
If you need a few write ups on doing that let me konw and I can also post links for turbos
Mine does it if the truck sits during the winter. Try driving the piss out of it for a few days with some hard WOT pulls and see if it dont clean her out. It cured mine. Remember blue is better than white......j/k