CANNABIS CULTURE -  Islamic accounts refer to a potent hash oil preparation known as dūḡ-e waḥdat, which may be similar to the Zoroastrian mang/bhanga infusions which I discussed in an earlier article. Hash oil was prepared in the Islamic world by boiling cannabis and skimming the drops of oil from the surface of the water. “Hashish oil is generally consumed by thoroughly mixing a drop of it with a litre of dūḡ (a drink made…