"It's also the case that in clinical research conducted with a few different doses of pure MDMA we have no found evidence of these kinds of problems," noted Mithoefer.
"I do, however, think it's important that people not think that MDMA is without risk," he added. "Especially with recreational use in an uncontrolled setting. Whether that will lead to mental health issues or not is unclear. But it is certainly something that bears further study."
For more on ecstasy, visit the U.S. National Institute on Drug Abuse.
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