Smoke on idle?
Smoke when you're on boost? (Is it still boosting ok?)
Oily (blue) smoke?
Sooty (black) smoke?
Steamy (white) smoke?
This time of year I get plenty of condensation blowing out of my pipes until the exhaust is good and hot. - Nothing to worry about.
I hope that's all your seeing; it seems like a common fault people report coming into winter before they realise it's just the result of a large bore exhaust.
If the turbo has shat its self, then there's the chance of doing damage with bits of it getting into your engine through the intakes. - That's worst case scenario because generally it's the (journal) bearing that goes, and it just leaks oil past it into the turbo... which has no long-term effect (although the plugs might foul).