Telling lies is a bad habit.

撒谎是个坏习惯。

Young people must awake to the risks of smoking and try to avoid this bad habit.

年轻人务必意识到吸烟的危害，尽量避免染上这样的坏习惯。

It's unwise of you to consider his wild behaviour as no more than a kid's game. It may gradually develop into a bad habit.

你把他这种疯狂行为视为不过是小孩子嬉戏，这是不明智的。这种行为可能会逐渐助长成为坏习惯。

The boy drifted into a bad habit.

这男孩逐渐染上了一个坏习惯。

Another bad habit has developed.

另一种坏习惯养成了。