hydrocodone isn't the generic name for vicodin, it's the opiate in vicoden that produces the effects you feel. vicodin also contains tylonol, which can be toxic in high doses. However, 4 pills a day isnt gonna do that, but taking tylonol constantly for a long period of time ( like a month or more, depending on your age) can cause liver damage. But back to the question, no you probably wont get addicted, most people don't. You might have a mild withdrawel upon stopping, but I dont think you have to worry about addiction.