Hi,
Use standard smoke containers, usually named a.smoke0, a.smoke1 and onwards.
The color tag is what you play with. It's the one like this:
color 40,40,40,255
The numbers are in this order:
Red, Green, Blue, Transparency.
So a value of 100,0,0,255 should get red smoke. Play around with the values to get the desired result.
Kieran.