ISLAMABAD - The use of traditional drugs, such as heroin and cocaine, seems to be declining in some parts of the world, prescription drug abuse and new psychoactive substance abuse is growing.According to the World Drug Report 2013 launched in Vienna at a special high-level event of the Commission on Narcotics Drugs (CND), the United Nations Office on Drugs and Crime (UNODC), said a press release issued here on Wednesday.The event marks the first step on the road to the 2014 high-level review by the Commission on Narcotics Drugs of the Political Declaration and Plan of Action which will be followed, in 2016, by the UN General Assembly Special Session on the issue.While challenges are emerging from new psychoactive substances (NPS), the 2013 World Drug Report (WDR) is pointing to stability in the use of traditional drugs. The WDR will be a key measuring stick in the lead up to the 2016 review.UNODC Executive Director, Yury Fedotov, said "we have agreed on a path for our ongoing discussion. I hope it will lead to an affirmation of the importance of the international drug control conventions, as well as an acknowledgment that the conventions are human, human rights centred and flexible"."There must be a firm emphasis on health and we must support and promote alternative sustainable livelihoods. It is also essential that we recognize the important role played by criminal justice systems in countering the world drug problem and the need for enhanced work against precursor chemicals", he added.According to World Drug Report 2013, in terms of production, Afghanistan retained its position as the leading producer and cultivator of opium.Nonetheless, given a poor yield, owing to a plant disease affecting the opium poppy, in Afghanistan, global opium production fell to 4,905 tons in 2012, 30 per cent less than a year earlier and 40 per cent less than in the peak year of 2007.In Europe, heroin use seems to be declining. Meanwhile, the cocaine market seems to be expanding in South America and the emerging economies in Asia. Use of opiates (heroin and opium), on the other hand, remains stable (around 16 million people, or 0.4 per cent of the population aged 15-64), although a high prevalence of opiate use has been reported from South-West and Central Asia,  Eastern and South-Eastern Europe and North America. New data reveals that the prevalence of people who inject drugs and are also living with HIV in 2011 was lower than previously estimated: 14.0 million people between the ages of 15 and 64 are estimated to be injecting drugs, while 1.6 million people who inject drugs are also living with HIV.