For those who smoke or chew betel nuts, this is also a fixed priority. Otherwise, when they've smoked up their cigarettes or finished off their betel nuts, they have no place to buy more.
對於有抽煙及嚼檳榔習慣的工作人員而言，這也是一個金科玉律，否則若是香煙抽完或沒了檳榔，可就沒地方買了。