New drugs are powerful synthetic psychedelics from the same chemical families as LSD, magic mushrooms and mescaline. They are too new to have enticing street names; instead their lengthy chemical names are shortened to abbreviations such as 2C-I, 4-HO-DiPT, and 5-Meo-DMT. Unlike ecstasy, methamphetamine or other synthetic recreational drugs, the new compounds are not made in illicit factories or backroom kitchen laboratories. Instead, "research chemicals", as they are euphemistically known, are synthesised by commercial labs, often based in the US, which openly sell their products on the internet.

The rapid growth in the transatlantic online trade in such chemicals has been fuelled by international differences over legality. While Britain has outlawed all of these drugs - under an amendment to the Misuse Of Drugs Act in February 2002 - they remain legal in most other countries, including the majority of EU member states. Even in the US, despite some of the most draconian anti-drug laws in the world, the bulk of research chemicals are legal to manufacture, sell, possess and consume.

With ecstasy dropping in price and popularity, users and dealers in this country are looking further afield to obtain new highs. A recent Home Office survey found that ecstasy use had dropped 21% in the last year. The street price had also dropped to an all time low of £2-£3 a pill.

But while most research chemicals are too psychedelically powerful to make it as club drugs, one, 2C-I, is rapidly gaining popularity in this country as a dance drug, thanks to some similarities in effect to MDMA, the main ingredient of ecstasy. More than 125 pills of the drug were seized by police last year, including 65 at the Glastonbury festival, and some London dealers are offering it for £10 a tablet.