In this tutorial author “Hector Bermudez” will explain you How to get a smoke effect without using fluids just nParticles from Maya with some images mapped to sprites with some easy steps.
This is the expression used for the particles :
nParticleShape1.spriteTwistPP = rand (-180,180);
nParticleShape1.spriteNumPP = rand (1,5);
nParticleShape1.MyRot = rand (-1,1);
This is the expression used for the turbulence Field in Phase X,Y,Z:
turbulenceField1.phaseX = turbulenceField1.phaseY = turbulenceField1.phaseZ = time*.1;
Creating Smoke Using nParticles in Maya