Here's an interesting article for you (by the University of Florida no less!)
http://news.ufl.edu/2005/05/19/mosquito-traps/
I especially like the part where the scientist says "He is concluding a study that showed CO2 traps were significantly outperformed by traps that used live hosts as bait."
I guess what you need to do is lure an unsuspecting victim to your smoking area and hope that their blood is sweeter than yours!
