Cocaine does this - floods the brain with dopamine. No biggie, so does an orgasm, even chocolate. Difference is, cocaine prevents dopamine reuptake. Brain can;t clean it. You stay high. Feels good, doesn;t it?
OK, so does Ecstasy. But the difference is, coke deadens the sensitivity to anything OTHER THAN coke to achieve dopamine surges. So orgasms and chocolate aren't going to do it anymore...in fact, NOTHING is, except cocaine.
That's why it is so destructive.