<br/> The United Nations says, drug use is moving away from cocaine and opiates and moving towards synthetic drugs such as amphetamines. In its World Drug Report it says, it expects that soon there will be more people using synthetic drugs than opium, heroin and cocaine together. The UN Office on Drugs and Crime (UNODC) also found that cocaine consumption has fallen significantly in the US in recent years. But the number of cocaine users in Europe has doubled, it says. <br/>