a compulsive habit that people obtain through repitition.

If you do anything more times than a frat boy says the word bro a day.

A disease of the mind characterized by compulsive repetitive behavior without regard for the consequences to ones life. There's more information about addiction and addiction treatment here: www.wmrehab.com

When you can quit doing something, as long as it's next Tuesday.

A habit that you can't quit.

some examples:
drugs,pokemon,yugioh,hookers,and nintendo

to physically or mentally need something

The internet.