This is the VOA Special English Health Report.

Tourists come to Zanzibar for its white sand beaches and historic buildings in Stone Town. But something else also makes its way to the Tanzanian island: heroin trafficked across the Indian Ocean from Asia.

Most of the heroin shipped through East Africa is headed for Europe and North America. But Reychad Abdool of the United Nations Office on Drugs and Crime says a lot of it stays on the continent.

REYCHAD ABDOOL: "We know for a fact that heroin is being used in at least thirty countries in Africa. And we also know for a fact that the number of countries reporting injecting drug use, especially of heroin, is also increasing in Africa."