In what context do people generally try heroin for the first time?

Pretty much everyone knows how destructive and more importantly addictive heroin is. Me in my right mind right now, if someone offered me heroin, I would obviously never ever do it, because in doing so I would essentially be consciously deciding to throw away my entire life.

Now, I understand addiction is a complex issue. I also understand that those who get into heroin are more often than not - not in their right minds like I am now. I can understand how someone's life can have stepping stones of destruction to the point that doing heroin doesn't seem like such an illogical step as it does to me right now.

But I constantly find myself thinking about someone in the moment right before they take the first shot, or inhale. Like in that very moment before someone takes the drug, what's going through their heads? What exactly is causing them to go through with it in that moment, and not having the sense to refuse it?

I suppose it would be great to get an answer from users/ex users. I just want to know how it's possible to go through with that decision to try it the first time