WARNING: THIS VIDEO CONTAINS GRAPHIC IMAGES A surge in heroin abuse across the US has resulted in a sharp rise in the rate of addiction and deaths, especially among younger, suburban users. Chicago is a hub for cheap, pure and plentiful heroin, much of supplied by Mexican drug cartels. BBC's Ian Pannel reports from the streets of the city. Subscribe www.youtube.com/bbcnews Check out our website: www.bbc.com/news Facebook: www.facebook.com/bbcworldnews Twitter: www.twitter.com/bbcworld Instagram: instagram.com/bbcnews