That's exactly what mine does and has done for over a year that I've owned it....bigish cloud of black smoke, does it much more when engine is warm, gotta make sure no-one's walking past the back of the car when I start it! Asked the same question when I joined the forum!
What colour smoke? If it's bluish white it's unburnt diesel and it means either your glo-plugs are f****d or your injector timing is out. On mine it was the latter, caused by a loose crankshaft pulley. It should not smoke.