article_snippet.sent: Scroll down for video .
article_snippet.sent: I get crazy if I don't get this.' '
article_snippet.sent: We want to stop but if you are addicted you can't just leave,' complains another.
article_snippet.sent: They go through stages of painful withdrawal on a daily basis between bouts of being high, with symptoms including restlessness, aching bones and nausea; and most are left with lifelong mental problems as a result of taking the drug.