from force of habit

Habit_百度百科 ... by force of habit 由于习惯(势力)而做某事 from force of habit 由于习惯(势力)而做某事 ...

as for中文 ... as for 至于,关于 from force of habit 出于习惯的力量 ... as the story develops/goes 随着故事的发展 ...