You stop cutting them.
stop using meth :)
If the teacher is staring at you, stare right back at them. If they are picking on you, ask them why they are picking on you and do everything they say and when.
no
wear gloves
tell him to stop and lock him in the closet!
You just don't do it.
Use will power
Stop!!
Ask him to, and if he does not stop it, then do something that annoys him when he does it. He may get it eventually.
First you need to admit that you need to stop picking your noes. Then you need to find another habit to do while your bored.like tap your pencil or tap your toes.
How about we stop picking on the kid that dances like (Censored).