His addiction to computer games means he is spending far too much time indoors.

addiction 是名词，来自动词 addict（使沉迷、使上瘾），后缀 -ion 表示状态或行为，指"上瘾、沉迷"的状态。 computer games addiction 指对电脑游戏过度依赖、无法自控的状态，即"游戏成瘾"。