The report into drug seizures in Europe in 2010 shows that while overall quantities coming in to the continent are dropping, Spain was still the European narcotics hotspot that year.
The International Narcotics Control Board study reveals that 27 of the total 35 tonnes of cannabis plants coming into Europe were detected in Spain in 2010.
For cocaine, 25 of the total 60 tonnes intercepted in Europe were in this country.
The research by the United Nations body, which investigates whether governments are complying with international drug treaties, says that one percent of Europeans use cannabis or hashish on a daily basis.
Some 6.7 percent of Europeans used those drugs on a yearly basis, the report found.
The International Narcotics Control Board stated on Tuesday: "While the abuse of illicit drugs in Europe has stabilized in recent years, it is still at a high level. In addition, new psychoactive substances remain a major challenge in West and Central Europe.
"The number of internet sites selling psychoactive products destined for the countries of the European Union more than quadrupled in two years, with 690 such websites in January 2012," stated the body