Nostrils. In a similar way to the ancient palm and rod measurements, it is based off the ruler of the country. It is custom whenever there is a new monarch to kidnap them and find out how much cocaine they can snort. That then becomes 1 nose of cocaine. The current nose, based off Queen Elizabeth II, is 736 kilograms. As you can see, this was rather disastrous for the economy as no-one expected her nose to be able to grow to those sizes at will