While in the 1600s, European travellers observed that East African persons smoked it employing coconut-based water pipes (Comoros) and antler-dependent pipes in Madagascar. A Portuguese account from the 1580s reviews using ‘bangue’ in the area, which happens to be considered to relate to the community expression for cannabis – bhang. https://rylanrmfzs.wikijm.com/1739521/everything_about_zanzibar_cannabis