Drugscope, the drugs information charity, says there is no significant clinical literature as yet on the effects.
Martin Barnes, chief executive of Drugscope, the national drugs information charity, says "we should avoid panicky, knee-jerk responses.
Martin Barnes, the chief executive of drugs information charity DrugScope, said: "While the broad downward trends we can see in today's figures on drug use among school pupils and adults are both welcome and encouraging, the UK still has high levels of drug use in comparison to many of our European neighbours.
An online survey of 442 university students in London carried out by the science-based drug information charity Drugs And Me, set up by three students shocked at the lack of honest discussion about drugs, found 40percentt had taken cocaine and ecstasy for the first time at university, and two-thirds had increased their drug intake since starting.
This breaks new ground internationally, says Martin Barnes, the head of DrugScope, a drug-information charity.No magic wandThe theoretical argument for payment by results is that, by rewarding only success, it drives up standards while reducing costs.
And information about charities, called BBB Wise Giving Reports, is available so consumers can check out the charity's record before deciding to donate.
For information and charities, Plaza Chapel, 212769-4400.
Basic information about charities is free at its Web site; deeper examinations require a yearly subscription.
Beginning in 1999, midlevel Clinton administration officials traveled to Saudi Arabia, Kuwait, Bahrain and the United Arab Emirates seeking information about charities aiding Al Qaeda.
