Can fentanyl addiction and heroin addiction be treated by a methadone program? Most people are familiar with heroin, the powerful street drug derived from the opium poppy, even if they have never tried the drug and don’t personally know anyone who has. It is commonly injected, smoked or snorted for its euphoric and sedating effects; you probably already know that as the user develops a tolerance for heroin, ever-greater amounts are needed to achieve a high or even to stave off serious withdrawal symptoms. Famous celebrities such as Philip Seymour Hoffman, River Phoenix and Janis Joplin have died of ...