I guess it all depends. Since last Friday I have only gotten through an 8th of weed because I had a cold. Picked up another 8th today though. The two weeks before that, however, I was spending about £80 a week on weed. I'd also be smoking other people's weed, and (obviously) sharing spliffs with my weed.

When I was living in halls at university, the amount of weed we smoked there was ridiculous. I swear weed was one of the biggest economies in the hall; there was certainly more money made from weed there than money made from drinks at the bar, haha.