After awhile, if you keep smoking more and more in one day, it won't get you any higher. All it ends up doing is burning you out even worse in the end.

I've went through phases where I'll smoke all day everyday for weeks. But after awhile, I won't even feel like I'm getting high anymore. So I would take breaks. There's nothing like lighting up a blunt after a nice, long break from weed. And the high will be incredible, I promise.