Snacks and fast food are harmful. So don't do them. The same way we say cigarettes are harmful and tell people to avoid them.
I don't know how else to dress it up? What are you expecting? The advice is 'don't do it'. Seems hard to pretend it's anything else?
we live in an unsafe world...
you either make these hard choices, or you suffer the consequences...
People like doing stuff that is unwise/unsafe/destructive, acting like they don't (ignoring the problem) and then throwing out dismissing quips isn't even an attempt at a solution.
Nudge theory[0] has worked in the past (within the limits of the problems). Dismissing those problems as trivial while waving them away as an individual choice hasn't been and cannot be because it doesn't even attempt to address the underlying issues.
[0] https://en.wikipedia.org/wiki/Nudge_theory#Types_of_nudges
If I was advising a government for how to change things in the next decade I might have some more ideas I could share!
"Just don't use addictive drugs. Just don't. That's the advice. How much more clear do you want it to be?"
"Just don't smoke. Just don't. That's the advice. How much more clear do you want it to be?"
This is how you sound.