You couldnt OD on an 8th....u could to 30+ grams and not overdose...u would probably just end up dying from what you did on the trip.

And for a 230lb person i would still only consider 2-2.5 grams of mush...seriously, if you want more, u can take more...but i would suggest doing 2 grams then bumping it up afterwords...because it can seriously mess u up.