Suggest you check your top intercooler hose from intercooler to egr valve body for splits or holes, also check the air sensor in the alloy section to ensure it is not leaking and finally ensure the plastic elbow that houses the seals is fully home in the intercooler.
We assume that your smoke is dark in colour and not white, if it's white smoke, you may need to have the injectors checked for spray pattern & leak-back.
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