How much harm DOES television cause?

I guess we will find out! I have TV addicts already. I have to admit that when I was pregnant with the boys, Leigha was able to watch more TV than normal. I would pass out on the couch while she watched her cartoons. Unfortunately, that never stopped. I now have three more addicts who are just mesmorized by the television. We are one of those families that have the TV on a lot, but we aren't always "watching" it. I just have it on in background. I just get a kick out of the look on the boys' faces as they watch TV.