New Zealand and Iran have been named as the countries with the highest rates of treatment for drug addiction in the world – but for incredibly different types of substances, namely cannabis and opioids respectively.

New Zealand reportedly has the third highest cannabis use in the world, just behind Iceland and the United States. In Iran, between one and three per cent of the overall population are reportedly addicted to substances, including a high proportion of heroin and methamphetamines.

Despite Scotland topping the list for the highest percentage of the adult population using cocaine, with England and Wales close behind, the most treated drug type in the UK is opioids, which includes heroin, opium, and pharmaceutical opioids.

The map showing what drugs countries seek the most treatment for (Recovery Brands)

Recovery Brands, an online resource for those seeking treatment for addiction, has used data from the 2014 United Nations Office on Drugs and Crime (UNODC) to map out the demand for treatment for different drug types and the types of drugs used most in each country.

The number of people treated for drug abuse globally (Recovery Brands)

It cites the high use of heroin in Iran as being due to its proximity to Afghanistan, the world’s largest producer of opium, and its part as a trafficking route for the drug, while highlighting a Washington Post report on the prevalence of methamphetamines being used by women-only salons in the country as a way to stay thin.

The top drug-using countries, listed by drug type (Recovery Brands)

Marijuana is found to be almost every country’s “top drug” in terms of its proportion of users, with the exception of El Salvador, Thailand, Laos and the Philippines, where amphetamine-type stimulants are more prevalent.

Cannabis was also the most treated drug in several African countries, many of which are large producers, though production does not necessarily lead to prevalence of use or addiction: in Colombia, the largest source of cocaine, the majority of its drug treatments were reportedly for cannabis use.