I definatly do lose my urge to smoke once in a while. I think its important to stop once in a while, especially if you don't feel like it. I'll smoke pot every day for two weeks straight, and then its like I feel almost saturated or something. So then I take a break. Its cool because when I take the break, I'll usually set a limit for how long I am going to 'fast.' Always gotta stick with it though, so if joints and stuff are passed around, I'll always say no. Takes breaks like that help me ensure I've still got control over the marijuana, not the other way around.