DRUG users have admitted that smoking cannabis and taking Ecstasy causes memory loss.

A study carried out by Newcastle University psychologists has shown that recreational drugs are damaging people's lives.

Involving 736 drug users, the study is believed to be the largest of its kind. It revealed that Ecstasy users even made errors while answering questions set by researchers.

Jacqui Rodgers, from the university, said the results of an Internet research project showed that users from across the world felt their memory was clearly affected by drug-taking.

Dr Rodgers said: "Cannabis use seems to lead to problems with everyday memory, such as remembering what you have done earlier that day. The more you smoke the more this appears to be the case."

She said Ecstasy use also tended to interfere with the ability to remember events in the future, such as an appointment, adding: "If you use cannabis and Ecstasy you are going to be doubly affected."

Most previous surveys of the effects of drug use have been small. But because those who took part have been guaranteed anonymity, the Newcastle University research has attracted many volunteers.

Now Dr Rodgers is appealing to other drug users to take part in new research using a modified website, which can be accessed at www.drugresearch.org.uk.

She said: "We are particularly interested in why people stop using drugs. Concern at memory loss could play a part in this."

Dr Rodgers' research will be discussed at today's British Psychological Society annual conference in Bournemouth.