I've got generational addiction in the family, including my mother. She drank, and it had a shocking impact on our family, and nothing - no amount of begging and pleading from her children, her lack of contact with her grandkids - was enough to get her to stop.
I've been paranoid about my use of alcohol and drugs my whole life because of it, and still am. There's clearly a genetic component (it's all over the wider family as well, if in a more 'functional' way), as well as a social one. I 'rebelled' by disapproving as a teenager and that probably bought me the time to become aware of the need to be careful.
But, I'm also lucky that the 'common' addictions for my family I seem to be lacking the 'gene' for, as it were. I can drink, without being unable to stop or without it feeling so 'nice' as to make it chaseable. I can take moderately strong painkillers without hitting any switch in my brain except the one that turns off the pain when needed. I've never touched weed, not once, or smoked, and I won't. I wouldn't dare risk anything else. Those have been choices on my part.
Too, I'm very rarely in a personal or social place to need to be actively looking for a crutch to help me cope, which was not the case for my mother, or my grandad and great uncle. I can say no, because I've got a great deal to say no for and not a lot prompting me the other way.
The potential is definitely there, though. I've had Diazepam once, as part of sedation for a medical exam and boy, can I see how that becomes a problem for so many. I've honestly never felt so calm, so peaceful, so uncomplicatedly happy, in a situation where I should have felt anything but. I'd be very reluctant now to let myself be 'prescribed' that, as opposed to the 'one-off-in-hospital' for exactly that reason - but, again, I'm fortunate to be able to say that.
I guess I'm saying - it's both, in a way. I saw what addiction did and I make and have made choices not to expose myself to things that could become a problem, but I also have education, luck and where I am in my life on my side. It's really not straightforward.