there are 4 things that can cause one to smoke white , egr cooler being the most common but you should see signs of a coolant loss , two the egr valve can stick open and cause white smoke but it should be underpowered and not run correctly unless the edge chip is masking it some, and three the turbo going out can cause a 6.0 to blow some white smoke , but should have some blue smoke mixed in ,if its just beguinning to go out you really want see a power loss but will smoke , would like a little more info on exactly when it smokes , the last thing that can cause white smoke is a injector working loose in the injector cup due to the hold down coming loose will cause white fuel smoke , usually dont see this problem unless someone has within a few thousand miles done an injector repair , hope this helps