When the rent on his East Lansing apartment is due, Mark Herberholz logs onto an Internet poker site for a few hands. He says the income from his winnings helps to pay the bills and pass the time. The Michigan State senior says he spends about four hours a day playing computer games, instant messaging with friends and surfing the Internet. But he spends only about six hours a week on the computer doing his homework. Herberholz is one of a growing number of college students spending hours a day at their computers for fun. But educators say the growing recreational use can interfere with studies and affect health and social development. Although alcohol is often blamed for low grades on campus, it ranked last in a 2004 survey by the American College Health Association of the top 10 impediments to academic performance. Only 8 percent of students on 74 campuses said alcohol got in the way of their studies, compared to 13 percent who reported computer gaming and Internet surfing as a problem. That\'s a jump from 9 percent in 2000, when the ACHA began recognizing it as a problem.