A dear friend (deceased pneumonia), drank a coke every day at 10 -2 - and 4! Honestly. I drink 2 cups of coffee each morning (I especially like 100% Colombian or Texas Pecan) and have a cup in the late afternoon. I don't think I am an addict. But, I must have a PB&J several times a week and when I was pregnant with my youngest son that was every day! He was the healthiest child you ever saw. Good addict? Now my BMI is 25, so my doctor doesn't care and I just had my annual blood tests and they were perfect, even cholesterol! Well, my thyroid is still a bit iffy! I think pain pills are useless. They don't do a thing for me. I once took an extra dose of a pain pill for my back, on the advice of my doc, and landed on the floor. The EMS thought I'd had a stroke and they asked me if I knew who the President was, I assured them I didn't know but I did know I didn't like him. That was Mr. O!

I don't have an addictive personality. Never was interested in drugs. So, I think my experience is telling. I suffered a very bad knee injury in college. Ended up with a cast from ankle to toe for a couple months. The first part of treatment was a big bottle of vicodin horse pills - with zero warning from the doc about any side effects. This was long before the opioid addiction awareness, before the internet (I'm old). I gobbled those pills for a while, often washed down with a beer. Stopped cold Turkey one day. My blood pressure spiked and I felt like I was going to die. Doctors, back then, had no clue what the problem was. I just slugged my way through it, not even knowing what the problem was. It was very tough - a real physical issue.

The popular view may be correct, that certain substances create the on-going need for them. (alcohol, sugar, opium..)
I wonder tho' how much personality contributes, it seems that some people are addicted to one thing, then get addicted to something else, it is as if they want or need a compulsion. The addiction can be a behavior, eg gambling.
so there can be two views- 1. where something happens and the individual is helpless, 2. where the individual has full or substantial responsibility.