I used to wear a sweatshirt with this design printed on it. Somewhat tongue in cheek, but I essentially believed it. Nothing really matters. Just enjoy what you can, while you can. Now, I'd be ashamed to wear it. My grappling dummy wears it instead.
I don't exactly disagree, though. It's misguided, but I still don't think anything matters, per se. Objectively speaking. Does this mean I'm ok with being miserable? Happy, sad, whatever? Well, no. Being miserable is our brain's way of telling us we're not ok. Philosophical objectivity aside, being miserable sucks. It's miserable. Whether or not it matters doesn't matter. Our health is important to us, as wheels and engine are important to a car. Mentally and physically, we might sustain damage or heal, thrive or break down. Our thoughts and feelings are only manifestations of that. We have feelings instead of dashboard lights.
Hedonism can be so ignorant as to what makes life enjoyable. Turns out, it's so much more complicated than just doing what we feel like doing. If the secret of life is a good cup of coffee, there's a lot that goes into being able to appreciate that cup of coffee. It's a luxury to be able to enjoy smoking pot, playing video games, or eating.
Even as a priority, we squander that, if we squander our mental and physical health. We won't enjoy any of it, if we don't take care of ourselves. Life being so terribly unfair, where we're starting from varies widely. We may have lots of damage to repair, lots of work to do, before feeling good is even possible. Others just have to avoid screwing it up too badly.
When we're in pain, relieving that pain can be the closest thing we know to feeling good. It can seem important, even. Addictive behaviour tends to occur when we do these things not to truly enjoy them, so much as to be distracted, relieved of pain. If that's the best we find possible, while everything else brings pain, it doesn't seem like such a bad calculation to indulge way too often.
This is in the short term, with no guarantee anything will work out any better in the long run. I've found that a lot of things do work though. A little, gradually over time, and all together, it adds up to being clearly worth more than all these things that can be momentarily enjoyable, all too easily overindulged in, to the neglect of everything else. In time, none of it is even enjoyable anymore, so much as mindnumbing escape.
We're still talking about taking painkillers away from people who tend to need them. It's hard. What works for me may be unnecessary for others. I don't know what's going on in anyone else's head. I'm not going to say that everyone needs to exercise the way I do. Not to mention eating. I'm an intermittent fasting vegan, but I do it so that I can enjoy eating at all. One more piece of this whole strategy for being I'm working on.