exhausts blowing white smoke

[m7757s]

hi everyone,

is it normal to have white smoke coming out of the exhaust, ive got a 06 4.2 tdi and it only seems to come out of the left hand side exhaust. A lot ov people were looking, when stuck in traffic the other day, not sure if they were checking just how cool the a8 looks, or how cool i look in my shades, or the big plume off smoke and thinking what a tw*t. Please put my mind at rest, it seems to drive ok.