There's one cure for heroin addiction. But is it a cure? Methadonia is the borderland between high and straight, where recovering heroin addicts on methadone "maintenance" exist.There's one cure for heroin addiction. But is it a cure? Methadonia is the borderland between high and straight, where recovering heroin addicts on methadone "maintenance" exist.There's one cure for heroin addiction. But is it a cure? Methadonia is the borderland between high and straight, where recovering heroin addicts on methadone "maintenance" exist.