What is heroin?
Heroin is a powerful painkilling drug, derived from opium, and first isolated from morphine in 1874 by Charles Romley Alder Wright, It is also a very addictive drug, according to the NIH, it has a 23% addiction rate. though it is generally just known as heroin, it's commonly referred to as smack, or specifically, low grade heroin may be called names like "black tar", smoke-able heroin "brownstone", and high grade heroin "oriental white" due it's southern Asian origins.
Why is it so bad?
Heroin is very dangerous, not just because it's extremely lethal, with over 10,000 deaths in 2014, but because it's also extremely addictive, do it once, and you're hooked. Even if you find help, according to Futures: Palm Beach rehab center, you have a 78% chance of relapse.