Well, since the velocity of the exiting gases is not very high and their mass is pretty small, I'd have to say that the side thrust component it is producing would be negligible compared to the weight of the plane. Is this a baited question???[&:]

Say, has anyone built a turbine scale model of the AV8B Harrier with full VTOL capability yet? Sorry, the question just popped into my head. I'll go ask in the jet forum.