How to make smoke emission not be affected by force field? I'm trying to make a scene that contains two smoke flow sources inside the same domain. I want a force field to be added in the scene to affect the specific smoke but the other to be unaffected by it. 
 If possible, I want both the emitters to be in the same smoke domain. If I have to make separate domain for each of them, it will cost me for render time. So, any help will appreciated. Thanks.
It can be done by having two domains, on different layers, each sharing its layer with its force field. 
I don't think that smoke particles within the same domain can be made to follow different rules based on where they're emitted from.