smoke flow force field.

I have a domain, and I have plane set as my mesh smoke object. I also have a wind force field for direction.

I have a sphere with a particle system attached.

I added a smoke flow force field, and choose my domain object.

but the smoke doesn’t really seem to be influencing the particles at all, no matter what setting I change in the force field. I remember it working pretty well in older versions, so i’m not sure if its a bug, or i’ve forgot to setup something.

I’m using 2.69 rc2

can anyone help?