A higher proportion of people die from one aspirin than one ecstacy tablet. (I'd also argue that, once legalised, ecstacy would be subject to stringent safety requirements).
Incidentally, Leah Betts died from excessive water consumption, not the effects of ecstacy. She drank 7 litres of water in 90 minutes. Why? Because someone told her she had to drink water while on ecstacy and she panicked.
When 'drugs' are demonised and not openly discussed, this is what happens. Untruths, rumours, crank medical opinion circulate and people feel unable to get help from someone older and responsible.
I agree that the long-term effects are unknown but we're supposed to live in a free society. And criminalising something because of evidence that MIGHT come to light in 50 or 100 years strikes me an odd approach to law making. Everything should be legal until there's sufficient reason for it to be otherwise.
We don't know the effect of mobile phone use yet. Should we ban them just to be on the safe side?
I'd never want children of mine to break the law - and I'd much much rather that they lay off all substances. But if all drugs were legal, I'd much much prefer my children to take ecstacy or cannibis than alcohol.
Think about it. If you heard of a new drug that made people unable to walk or talk properly, and that made them aggresive and irrational and frequently vomit or pass out, you would be absolutely appalled.
I would also mention the massive reduction in crime that would result from decriminalising some drugs, but I can't be bothered.