Winne, It might it have something to do with the fact that the high from crack doesn't last very long at all. I think it only lasts like 10 or 15 minutes, I could be wrong though. Pain pills, they stay in your system for longer and the more your take, the more your system becomes addicted. SO when someone finally goes into detox...they are having to purge their system of sometimes years worth of drugs in their body.