His addiction destroyed his life.

He is said to have a habit of lying.

He is always late, nonetheless, his grades are always at the top.

The term 'stereotypy' is a part of ethology, referring to the phenomenon where a specific animal repeats a specific behavior.

He has a habit of chewing loudly, so he often makes noise while eating.

There is a proverb, 'a cornered rat will bite a cat,' which means that a person driven into a desperate situation will fight back even against an opponent they would normally fear.