AdSense really don't like Traffic Exchanges. But, I've seen AdHitz ads on many sites in traffic exchanges.
No, they don't, you'll get banned. Traffic from traffic exchange sites is bad traffic anyway, it doesn't usually convert into anything.
me too want to know , if i want to get traffic from traffic exchange program will banned me from adsense
Make a simple, "splash" page, that is shown in Traffic Exchanges. When somebody clicks on it, it opens your real page. Here is an example: http://www.home-online-work.info/traffic/db/dbsplash-1177440803-zydd.html
2leep and MGid having 30% half adult type photos which is not suitable for some sites and adsense. I highly recommend Jugglu.com (Adult Safe) good for your site with 200%-300% traffic.