くせになる

expression, godan verb (-ru)

become a habit; be addictive; be moreish

Describes something that you can't stop doing or eating because it's so enjoyable or compelling. Often used for tasty snacks, games, or behaviors.

• このポテトチップスは癖くせになる味あじだ。

  These potato chips have an addictive flavor.

• スマホゲームが癖くせになって、夜よ更ふかししてしまう。

  I've gotten hooked on smartphone games and end up staying up late.