Smoking a durrie refers to a cigarette.
During the 1st world war, ANZACs , particularly the Australian Light
Horse, trained in Egypt before deploying to the Dardanelles. While training they had some time off in towns, where they could buy souvenirs and comfort items
like tobacco. Tobacco was sold in the market place, and displayed on carpets, called dhurries. If you got to the market at the end of the day, and bought the last of the tobacco, they sometimes got some carpet
fluff mixed in with the tobacco, and the diggers joked that they were smoking more carpet
fluff than tobacco, hence the term smoking a dhurrie. Still used in the Australian
army to this day as slang for a smoke= durrie.