This is a serious but off topic question: how come people I know can ingest methamphetamine once a month to catch up with work, but in rural communities, meth i

This is a serious but off topic question: how come people I know can ingest methamphetamine once a month to catch up with work, but in rural communities, meth is an epidemic with rampant addiction? Is it the route of administration? The unemployment/economy differences? Adulterants? I've done meth before and though I saw the value, I really couldn't see the joy in taking it very often.