takin 1-2g at a time isn't uncommon. most the lads I know are at that stage. they also have bladder issues.
one of my close mates took 5,6 maybe 7g a day. was pissing every 5mins. caused irreversable kidney, bladder, prostate and stomach problems for him. in the end he stopped drinking and eating coz it was too paintful and hed rather just get kholed so he couldn't feel it. 12months of heavy use then a week of not eating killed him.
but that's an extreme case of an addict. I personally have a bit when out and keep the kholes to my house.
some ppl avoid the kholes coz it makes them sick or find it hard to breath. very nice drug but has a very dark side and some of the worst side effects.