Health Risks from Heroin Use
"Chronic users may develop collapsed veins, infection of the heart lining and valves, abscesses, and liver or kidney disease. Pulmonary complications, including various types of pneumonia, may result from the poor health of the abuser as well as from heroin’s depressing effects on respiration. In addition to the effects of the drug itself, street heroin often contains toxic contaminants or additives that can clog blood vessels leading to the lungs, liver, kidneys, or brain, causing permanent damage to vital organs."
National Institute on Drug Abuse, DrugFacts: Heroin (Rockville, MD: US Department of Health and Human Services, Last Revised March 2010), last accessed Jan. 12, 2013.