Much emphasis is devoted to firearms and the needless deaths inflicted each year. While not as deadly as guns, Americans have another love affair that's producing fatal consequences.And, believe it or not, it's our cellphones.Turns out, those handy devices we take everywhere and can't seem to spend a moment without aren't the best companions when we get behind the wheel. They snatch our attention from the road and, according to statistics, are a leading cause of motor vehicle accidents.The National Highway Traffic Safety Administration classifies distracted driving as any activity that diverts our attention from driving.