Do i have some sort of mental problem?

You know how people like to chew gum, chew their fingernails, suck their thumbs and other things. Well i really like to gargle mouthwash. Like ill go to the store and purchase a bottle of mouthwash for the day like it was a pack of gum. Everytime i try to stop i really crave it extremely and have to get somemore. This has been going on for about 7 years. Do i have some sort of complex or mental problem?