Statistics like this are pretty suspect, if they are based on a straight survey. Asking people whether they have tried a drug just gives you figures for what people say, not necessarily what they do.

In certain circumstances many people who haven't tried it are going to say they have, and in certain circumstances those who have taken it are going to say they haven't. Sorting out that kind of distortion would be a very complicated and demanding process.

I think it is highly unlikely that truly accurate figures on this kind of tricky subject will have been obtained by researchers in countries across Europe.

It could well be true, but building too much on this kind of survey is not justifiable.

The main danger appears to lie with dealers cutting cocaine with other substances, and that is part of the damage caused by the existing "drug control" policies which prop up the illegal drug business, and ensure that it remains so profitable.