Great topic. When I was 18, I witnessed a bunch of guys getting addicted to heroin. It was said that the heroin was almost pure, 93% to be exact. It was so strong that they'd mix it into a cigarette and get high from it just like that. It was cheap also.
This was an unheard of situation actually, and I was there because I had no other choice concerning being there with them. I had committed myself to being there in an unbreakable contract with the U.S. government. After being coaxed repeatedly, I tried it once in the cigarette, and after a short time, I discovered what the phrase "rubber knees" means. That's how my knees were, like rubber and I couldn't stand up. I then got sicker than I'd ever been, throwing up violently.
That pretty much told me that I wanted nothing to do with something that could affect me that way. And the thing is, everyone who ever takes heroin, is going to get sick like I did. So, I've always wondered why these guys went all the way to addiction, when they went through what I did, weren't addicted, but still continued going through the getting sick routine until addiction took over. Eventually they all went to injecting it.
One guy actually kept getting sick every single time he used it, even AFTER he was addicted!
I know for a fact that it is NOT easy to get addicted to heroin, because one has to bear all the pain and agony of getting used to it before they can be addicted.
It's the same with alcohol. I drink alcohol, but I limit how often I drink, because I know if I drink too often, I could become an alcoholic. Since that experience watching heroin junkies in the making, I've always been baffled about why so many humans force themselves to go through the part of getting addicted, to actually become addicted!
RE: Things you don't learn in school- What is addiction?