A study done at the  School of Population Health at the University of Queensland, Australia, found that if you’re over 25, the lack of activity involved in watching an hour of TV can shorten your life by 22 minutes, which incidentally is the same life-shortening effect of smoking two cigarettes. So if the average American watches five hours of TV per day, they’re shortening their life by 110 minutes–or nearly 2 hours–every day. This comes to 12.8 hours a week, 55 hours a month, or 27.9 days off your life every year just so you can watch The Real Jersey Shore Housewives of American Idol. Double that if you smoke two cigarettes per hour while watching TV. And no, watching P90X infomercials doesn’t cut the life loss by 3 minutes per hour as rumored.