Are you a regular user of ecstasy (MDMA)? Then, you may be at risk of developing an addictive need for the drug. More here on how ecstasy addiction is formed and how you can avoid it.
How does ecstasy affect the brain, body, and organs? A brief review of the effects of ecstasy on the body system here.
While tolerance to ecstasy is uncommon, it can occur in regular or high doses users. More on the phenomenon of tolerance here, with a section for your questions at the end.
Can you become physically dependent on ecstasy? Yes, but while physical dependence on MDMA is rare, psychological dependence can occur in regular users. More on the distinction between dependence and addiction here.