Why would a person post on Douyin to quit smoking and stay up late?

The most likely reason is to ask others to urge him, or to tell others that he is getting better.

Quitting smoking and staying up late are signs of getting better. Even if you have been bad before, you still want someone to praise you when you get better.

Or maybe you don’t trust yourself at all and know that you will not be able to persist and will make the same mistakes again, so you need someone to supervise you, that is, check in online.