The data is really difficult to make sense of, and that does indeed make many people weary of overdoing it. But from the anecdata I have, it seems the 6-month i

The data is really difficult to make sense of, and that does indeed make many people weary of overdoing it. But from the anecdata I have, it seems the 6-month intervals are often motivated by the desire to reset one's tolerance. One surprisingly effective safety feature of MDMA (unlike other amphetamines) is how self-limiting it is. A second dose within even a month never creates the same, life-changing experience as the first, not even if the dosage is increased. Some people still enjoy the effects of such a second dose and freely consume MDMA every weekend, but for many it seems to be more of a 'meh' in comparison, and not worth the health and legal risks.