Evelyn - the US Gov was releasing all this research talking about the risks of X that has since been thoroughly discredited as bad science. The doctor 'accidently' used speed one time instead of X when testing lab rats - the conclusions of that study made from page news! the retraction that followed wasn't on the front page - go figure. The government has lost its credibility in supplying information on the pitfalls of taking X.
In moderation, i believe X is pretty low-risk. A couple of people do randomly die every year from taking it, but the odds are lower than from taking most prescription drugs. Of course if you are one of those taking 5 pills every friday and saturday nite i'd say you are causing some sort of permanent damage...what the damage is/will be remains to be seen. Estimates are that 1 million pills are taken every Sat nite in England...and have been so since the late 1980s.....they have not been able to establish any sort of abnormal number of people with brain functions in England....hence the scepticism.
If you take X, be safe and don't overdue it...and don't do it every weekend!
