Cuban life expectancy is almost exactly equal to American life expectancy; likely better over the last two years, actually (https://www.cdc.gov/nchs/pressroom/nchs_press_releases/2022/...). They don't seem to be doing that badly at keeping folks alive.
American life expectancy is absurdly bad. I live in the places in Europe/EU where it's much higher, so to me it really is very bad (and yes we are making fun of US because of it too).
Most of that is self-inflicted though. Lifestyle-related.
It's not a bad thing either, you can live your life like a saint and still die young of cancer. I think we're focused on physical instead of mental health too much sometimes.
If people like to live a certain lifestyle and know the risks, just let them.