Terrifying enough it is both. You measure in grams as a fraction of ounces until you get to an ounce and then you measure in those until you get to pounds unless its so much that you move back to kilograms.
Joint = 1 gram
1/8th = 3.5 grams
1/2 = 14 grams
Yeah, kind of exactly the nightmare of a “writing system”. Its a dare to try to explain it in less than 10 words.