 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 Rayshad Abdul of the United Nations Office on Drugs and Crime says a lot of it stays on the continent. We know for a fact that heroin is being used in at least 30 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. The problem in Zanzibar has led to some creative local solutions. Sulamman Mali stopped using heroin six years ago. Now he operates a network of so-called sober houses. These are run by addicts themselves to help one another recover. There are nine sober houses, eight for men and one for women. Mr. Mali himself went through a drug treatment program in Kenya. But it cost around $2,000, he says. Staying in a sober house costs about $100 a month. Most of the people are supported by their families. Treatment is based on the idea that drug addiction is more of a public health problem than a crime. Mr. Mali says this is still a new idea to many people. Because addiction, it's a disease and addicts need treatment. But people, they hear that addicts are bad people and they need punishment. He says in the sober houses, the addicts are in charge of nearly everything. It's a new method to Zanzibar. It's a new phenomenon to East Africa, whereby drug addicts take responsibility to run the system. This responsibility, he says, is important to building their belief in their own abilities. The men also learn woodworking as a way to earn money. Much of the program is based on the 12-step program of Alcoholics Anonymous. But it also includes art therapy, yoga and even acupuncture. This is done by Kasim Nuni, a sober house counselor and former addict. He was trained by a volunteer from a Chinese medical school in Hawaii. It reduces tension and it's relaxing. It's a kind of treatment that's very effective for the recovering addicts. Still, he estimates that around 60% of those in the program return to heroin. Sulamon Mali hopes to expand the network in Zanzibar. His next goal is to send former addicts to work with heroin users in prisons. For VOA Special English, I'm Carolyn Presuti.