There are many good reasons to avoid illegal drugs, like addiction and overdosing. The next best is that local street chemists aren't terribly trustworthy. It's common for drugs to be mixed with other chemicals, some of which are far more dangerous than the drug itself. Case in point: Fentanyl, which is often mixed into heroin.
Fentanyl
The overdose epidemic sweeping the nation is hitting some demographics harder than others. Heroin overdose deaths began to skyrocket in 2010. New data shows that of all groups, older millennials, those aged 25-34, are the likeliest to die from a heroin overdose.
It should come as no surprise that Prince, who was rumored to be addicted to oxycodone, died from an overdose. But it was not oxycodone that killed him. It was fentanyl, perhaps the deadliest drug ever to hit the streets.
Twenty-five years before Walter White broke bad, an organic chemist at DuPont cooked up a scheme that has never been matched--the synthesis of a mega-potent version of heroin worth $112 million for only 8 ounces. Then, things REALLY broke bad.