Loanword from English 'addiction', used in contexts such as substance dependence or behavioral addiction. Often seen in compounds like ゲームアディクション (gaming addiction).
彼はスマホアディクションに悩んでいる。
He suffers from smartphone addiction.
依存症 is the native Japanese term for 'addiction' or 'dependence', more formal and clinical than アディクション.
Borrowed from English 'addiction'.