New research shows that cocaine users are putting their lives at risk with “lethal cocktails” that can result in sudden death. "The notion that recreational cocaine use is 'safe' should be dispelled, since even small amounts may have catastrophic consequences, including sudden death," said Joaquin Lucena, head of forensic pathology at the Institute of Legal Medicine in Seville, Spain.

The UK’s Metro reports that Lucena and his team studied sudden deaths in southwest Spain between 2003 and 2006 and found that 3.1 percent of them were related to taking cocaine, which had damaged the heart and arteries. The researchers also found that all the cocaine sudden deaths were in men aged between 21 and 45, and 81 percent of them also smoked, while 76 percent had also consumed alcohol.

Ethanol, the intoxicating ingredient in alcohol, enhances the high users get from cocaine and softens the subsequent low. But both smoking and alcohol are also linked with heart disease.

"The combination of cocaine with either or both of these habits can be considered as a lethal cocktail that promotes the development of premature heart disease," Lucena wrote in the study, which was published in the European Heart Journal.

Lucena also said he believed his findings could safely be extrapolated to much of the rest of Europe, suggesting cocaine use is a significant public health threat.

"Cocaine abuse is a growing public health issue in Europe and we can only monitor its prevalence by performing these detailed autopsies whenever someone dies suddenly," he wrote.

Experts at the Spanish Institute estimate about 12 million Europeans use cocaine—about 3.7 percent of the total adult population aged 15 to 64.

More than 5 percent of adults in Britain, Spain, and Italy say they have taken cocaine at least once in their lives and use is higher among those aged between 15 and 34.

"As the estimated number of European young adult cocaine consumers is similar in Spain, UK and Italy, there is no reason to consider that cocaine-related sudden deaths in UK and Italy would be different to what we have found in our research in south-west Spain," said Lucena.

Fotini Rozakeas of the British Heart Foundation charity said the study showed the need "to dispel the myth that cocaine is a 'safe party drug.'"

"The potential deadly consequences from cocaine use can happen to anyone who takes it, even in previously young healthy people with no history of heart disease," she said. "The reality is that there are risks every time you use it.”