> Then everyone has an interest in generally reducing smoking and bettering diets.

In what country do folks say "I better not do {whatever} because it will result in higher health care costs for me paid by others?"

Even if there are such countries, do you expect to find many such people in the US?

Reminder - it doesn't matter what works/doesn't work in other countries. What matters as far as the US is concerned is what works here.

For people over age 65, we do have a single-payer healthcare system: it is called Medicare.

There's also Medicaid, which is universal national coverage for all children and most adults near the poverty line.

Which loses somewhere between $60-100B to fraud each year AND is more likely to deny coverage than private. (Since the "top execs salaries and profits" of private are <$10B/year ....) Oh, and MDs tend to abandon Medicare when given the choice.

But, Medicare can physically cut a check for almost nothing.