Exposure to media violence

"Summarizing the results of >400 studies including violent media of all types, researchers found there was a significant association between exposure to media violence and aggressive behavior (effect size: 0.19; 95% confidence interval [CI]: 0.19–0.20), aggressive thoughts (effect size: 0.18; 95% CI: 0.17–0.19), angry feelings (effect size: 0.27; 95% CI: 0.24–0.30), and physiologic arousal (effect size: 0.26; 95% CI: 0.20–0.31).11 Another study performed a similar analysis focusing only on video games. The results, based on 140 such studies, found slightly larger negative effect sizes.10 Some contend, rightly, that these correlations are in the small to moderate range, but they are stronger than the associations between passive smoking and lung cancer, and many municipalities have banned smoking because of that risk.12"