Smoke, problem. Haze, not necessarily a problem, as long as the volume is kept to a minimum. (Look Unique fogger here).
And that's all that's needed to reflect light/laser energy, which certainly adds to the impact of lighting.
Anyone running the new Mackie DLM series of powered speakers?
They certainly appear good, if the specs are anything to go by. They're compact and light, too... that's always a bonus!