obsession

Gambling became an obsession, and he eventually lost everything.

他迷上赌博，最后失去了一切。

The game pachinko became a national obsession.

弹珠机游戏已经风靡全国。

He has an enthusiasm for art, to the point of obsession in my opinion.

他对艺术很热衷，在我看来已经到了痴迷的程度。

She looked after him with a devotion bordering on obsession.

她尽心尽力地照顾他，简直到了沉迷的地步。