Earlier quoted context omitted.
MDMA (if that is what you mean, as street 'Ecstasy' can contain any number of other ingredients) is by most metrics one of the safer recreational drugs out there. https://en.wikipedia.org/wiki/File:Rational_scale_to_assess_... http://www.bbc.co.uk/news/uk-11660210
MDMA is not old enough to show it's long term effects the way smoking or drinking has. One study of 52 users that where hand selected out of 1500 that showed no cognitive impairment. http://www.addictionjournal.org/viewpressrelease.asp?pr=147 Others studies both before and after have demonstrated issues. The problem is it's hard to find good data on individuals before they started heavy use, and sleep deprivation and…
Going to prison.
Putting people in prison for harming themselves is the height of absurdity.