The United Nations drugs watchdog says the practice of injecting drugs is on the rise in Africa, and warns this could exacerbate the HIV/Aids crisis.
Africa is being used to traffic drugs to Europe
The International Narcotics Control Board (INCB) said drugs such as heroin were becoming more common in eastern and southern Africa.
The INCB annual report noted that in countries emerging from conflict, drug abuse continues among child soldiers.
It said there was evidence to suggest that some conflicts were partly funded
by profits from drug-trafficking.
The report called on the international community to help African states in their efforts to fight drug abuse and trafficking.
"Most countries in Africa have no adequate legislative framework and lack the necessary administrative mechanisms for the control" of drugs, the INCB said.
Cannabis is grown and smoked in many African countries.
But the INCB said the Africa was increasingly being used in the trade of cocaine from Latin America and heroin from Asia to Europe.
As a result, the abuse of these drugs was increasing on the continent, the report said.
But the report noted several major drugs hauls, mostly of cocaine in West Africa:
The report also said there was a steady rise in illicit sales of controlled drugs on the internet.
600kg (1,320 pounds) in Ghana
450kg in Togo
200kg in Cape Verde
140kg in Benin
It said substances with possibly fatal health risks were being sold.