Movement Physics in Particle playground

I have a simple 4-second comp it is a clip of a car moving about 14ft (a to b). I used a particle playground to create smoke from the car's engine. Then, I used a null with tracking to make the smoke follow the vehicle. LOOKS GREAT !!

However, the smoke is just going straight up in the air, and in real-world physics, it would be affected by the wind caused by the car's movement. 

How can I create this effect so that the smoke moves somewhat realistically with the car?