3.8 million people (1.5 percent of the population above 12) say they have tried heroin at least once in their lifetimes. In 2005, nearly 6.2% of high school seniors reported using methamphetamine at least once. Next, the freebase cocaine is converted into cocaine hydrochloride. This is the white to off white crystalline powder most think of when they imagine of cocaine. The reasons for converting freebase cocaine into a salt form include: Heroin users who inject the drug expose themselves to additional risks, including contracting human immunodeficiency virus (HIV), hepatitis B and C, and other blood-borne viruses. Chronic users who inject heroin also risk scarred or collapsed veins, infection of the heart lining and valves, abscesses, pneumonia, tuberculosis, and liver and kidney disease. | 
