Tough question. One time in college we had the 'Day of Many Drugs' - a group of about eight us had collectively enough of everything to get us locked away for decades. Multiple sheets (hundred of hits) of LSD, lots of shrooms, mescaline, close to elbow (maybe more) of weed, hash, don't even remember how many eight balls and some X. There were pills in there too, I think valiums, oh yeah, and some speed. It was a hell of a sight to see all laid out. If we'd of had ether, we could have given Fear & Loathing in Las Vegas a run.
Before the era of digital cameras. It was shortly after that I took a little break-we were starting to attract attention.
Back to the topic though, about an oz and a touch in day. Probably most of a quarter lb. in a long weekend, with a little help from my friends. If its killa, tough to smoke alot. If its not killa, tough (these days) to stay motivated to smoke alot.