smoke / haze outside

[spac]

I am in charge of the lighting for a live outdoors music festival at my university in the summer term. we are planning on using 6 scanners and I thought it would be nice to be able to make a smoke effect so that the beams of light can be seen.

 

We will have a canopy over the stage. Has anyone ever tryed smoke effects outside before? Is a waste os money hireing in some hazers / fogg machines? does anyone have any ideas or techniques to making the effecrs work well outside?