To be considered an addiction, in my mind, the action must have a steady negative impact on your own or someone else's life. If you are doing anything in excess to an extent that it is keeping you from providing a house, food, ect for your family...it is an addiction. Those things come first. If you are taking the funds to support your family and using them to support a habit, it is an addiction. If you are always stoned out of your mind and cannot possibly drive someone to a hospital in case of emergency, it is probably an addiction (only case it wouldn't be is if you do your deed in a situation where at least one or two people are sober and can take care of others if need be...then it isn't necessarily an addiction...case by case basis).
Everybody has a low that helps them relieve stress. It is when this action impacts life in a negative way that you have a problem. If a loved one is being hurt by your actions...straighten up or get out of their life. Don't selfishly hold other people back