Addiction is an equalizer. It doesn't matter how much money one has or what they have access to, sobriety is a life long battle for anyone who has had a serious addiction.
I've spoken before about coworkers that I've seen use coke recreationally and I never understood how most of them could still function and not be addicted. However, what I've learned and realized is that you first have to start with an addictive personality; once you find your trigger, it's damn near impossible to stop.
A friend of mine lost his wife due to drug use spawned on from PPD. Prior to, she barely drank alcohol but as the efficacy of the depression meds wore off because her tolerance grew stronger, she got stronger treatment and then it snowballed. This is how it starts with many people; instead of receiving the proper mental health help she truly needed upfront, she was given half assed treatment coupled with drugs. Eventually she started abusing pills because it gave her relief even though she loved her children desperately and was always a great mom, the momentary break from her depression seemed to outweigh everything after awhile. That was also when I learned what true depression looks like in person....this was a woman who I would never have guessed would put her kids second to anything and here she was putting pills before them.
It's easy to say people are making a choice, they're being stupid or that they're not taking sobriety seriously if they fall back down. All of that is true when it comes to taking that very first drink/pill. However, that's not the reality of addiction. The reality is that it starts small and builds on itself. By the time someone is an addict, in many cases, they don't even know how they got to that position. Anyone who takes a medication or has a cocktail makes themselves susceptible to addiction...all it takes sometimes is that pill a dr prescribed for a surgery, migraine, chronic pain, depression, ADHD, etc.
Sobriety is a lifetime treatment.