i agree with Jergus man... that was some sound advice. Only you and your family or the people around you know if you have a problem. If its affecting your ability to be a normal, healthy, repsonsible, and productive individual... then gain some self control and cut down. I've seen a person addicted to weed before. He smoked for breakfast, at lunch, and after getting off work ... smoked the rest of the night from a bong until bedtime. He was a moody son-of-a-bitch. When a person is seriously addicted to marijuana it gets to be almost as ugly as an addiction to a much harder drug.
Get a hobby that involves being sober for a while. It sounds like you could use one.