Why is ecstasy abusable?

Well it isn't really so bad, but it can cause overheating of your body, dehydration, and when you are high, the brains uses most of "serotonin". Serotonin is responsible for good mood and some other stuff. When you take Ecstasy, big amount of serotonin us pumped, which makes you feel very good. But when you come down from high, you have low level of serotonin, which makes you depressed.

That depression lasts from day to 7 or more.. depends on usesage

Well, ecstasy isn't much worse from other legal drugs, use it responsible!