The study also found those students who reported an "irresistible urge" to be on the internet and tension when they weren't online were more likely to be depressed and aggressive and to use drugs than their peers.
However, researchers reporting in the Journal of Clinical Psychiatry say it's not clear that the obsessive computer use was causing the depression and related behaviors.
Scientists say more studies need to be done to get at the causes behind different kinds of Internet use.
