I see quite a number of comments making some very wildly inaccurate statements about the pharmacological safety of MDMA. There have been a number of studies conducted about the health impact of MDMA. In monkeys, it has been shown to leave behind long-term brain damage, serotonin receptor damage for at least 7 years, etc. Personally, back at University I had some acquaintances who got quite addicted to them and appear…
I also couldn't find much studies on MDMA itself, as most such studies refer to some sort of pills, which are usually mixed with other drugs (e.g. Speed).