I agree with Nick about smoke from Turbo failure . Your level would drop quite quickly too. Check intercooler hoses to see how much oil is in them.
Blank off the EGR's and sort the injector and see where you are. Find the blanking kit on a well known auction site for about £40.
Cant advise on Turbo's but Mikey does it for a living and most on here respect his opinion.
Good luck with it. 2007 Vogue TDV8 in Zermatt Silver with Charcoal