The tolerance built by one dose of MDMA is dissipated after a few weeks. That is, the first time you took a dose of MDMA, the tolerance was gone after a few weeks. But as we all know, MDMA is a phenethylamine, a phenethylamine of the amphetamine class. Unlike Tryptamines which build a strong tolerance rapidly, which dissipates just as rapidly, Phenethylamines tolerance is built gradually. Which means it goes away gradually. Repeated use while the tolerance is still there, further cements the tolerance and prevents it from going away effectively and as soon as possible. If you haven't had any MDMA in over a year, taking a dose would mean, a month after you took it, you'd be virtually back to baseline. If you've been involved with heavy MDMA abuse in your past, you may honestly never reach baseline again, but it doesn't mean you can no longer partake in MDMA and reach good effects. It just means you'll need to be wiser for the wear. So people, give it a couple months in between your consumption, and never let the magic desert you.