Heroin is an illegal, semi-synthetic drug made from opium poppies. It is considered one of the most addictive drugs available because of its fast interaction with the body's natural opioid system. About 750,000 people use heroin in the U.S. each year. Heroin is more dangerous today than ever, because it can be mixed with stronger opioid drugs like fentanyl, leading to fatal overdoses. Heroin is one of ten titles in the Young Adult Drug Library series. Nine titles spotlight a major drug or type of drug (such as painkillers); discuss the negative physical and mental effects of the addiction on the addict and the potential benefits of their use (for certain legal drugs); and provide an overview of treatment strategies for the addiction. The last title, Facts & Figures, provides readers with the "big picture" regarding drugs, including their pros and cons; how they are made, distributed, sold, and used; why they are abused or misused; and treatment options for those who become addicted. Stories of those who are battling drug addiction are also featured in the series in order to humanize these issues.