I know there is another active thread about stimming, but I didn't want to hijack the thread, or have my question get buried.
What is the difference between stimming and nervous 'fidgetting'? I'm not sure that fidgetting is the right word but it sort of fits. NT's do little things similar to stimming all the time such as a girl twirling her hair, or a nervous perssonchewing on a pencil, or the smoker playing with his cigarette before he lights it, and so on.
Can anybody explain the difference between these two similar behaviors?