http://ping.fm/60SWj Drug addiction or substance abuse involves the continual usage of alcohol or nicotine, cocaine, opiates, sedatives, amphetamines or alike drugs which chemically affect the brain after an extended period of usage leading to irrevocable dependency and painful withdrawal symptoms unless treated at suitable drug addiction centers. This individual is not productive, economically or socially. His earth revolves encircling drugs and his aim is to get the following fix, the following high.