David, did you do anything else in that time?
Go to work?
Read a book?
Play baseball with the boys?
Go to a barbeque?
Do your damn laundry?
If the answer is no, then you smoke too much pot and need to get a life!
I think the amount of herb you go through isn't nearly so important as the overall richness of your existence.
If you are active and do all sorts of other shit and hold down your job/school/family life well, go ahead, smoke yourself silly, whatever!
If it interferes with your other hobbies or if you have no other hobbies other than getting roasted, cut back.