FYI----Below is a link to a recent study regarding the long term effects of ecstasy use. The research is still a little sketchy (small sample size, confounding factors) but the bottom line seems to be that ecstasy use does have some effect on memory, particularly verbal, but the effect is very small. The authors make note of the difference between statistically significant and clinically signifiicant; pointing out that a statistical effect does not necessarily translate to real world effect.
http://tinyurl.com/bgefsx
http://tinyurl.com/bgefsx