Neither of those scenarios are ideal.
If the only question was genetic differences, that’s a risk I think a lot of people would be willing to take (e.g., that I might be healthy until 100 and then die in your sleep, theretofore paying constantly for others who have had medical problems for 70 years straight). I myself would be willing to take that risk / pay for that style of universal coverage, if not for the aforementioned choice part (smoking, etc.) playing so heavily into the cost, in practice.
You are probably underestimating your own unknown non-lifestyle associated risk, along with the risks your offspring represent.
It also costs a lot to detect and judge risk factors, manage individual risk pools, assure compliance, etc. You save a lot of money by simply not bothering to risk-qualify eligibility and this offsets the costs associated with carrying lifestyle risks in a single large pool.
Assuming it's genuine, it's also misguided. Almost no-one wants to be obese, alcoholic, etc - accessible healthcare will reduce the incidence of all of these, which in turn will reduce the externalities associated with them.
You also don't need further state control to discourage smoking, drinking, junk food, etc - taxation is the mechanism used globally to discourage undesirable behaviour.
Almost all these things are biologically addictive, and furthermore the companies selling them have long known about their addictive qualities and then built marketing campaigns to ensure the public was not aware of the risks.
Taxation is how you recognize the externalities of this behavior while maintaining a free-market system.
Also, it’s easy to look at something like cigarettes which pretty much everybody would agree are a terrible idea, and say, “fine, tax em”, but what about when it’s sugar, then butter, then red meat, etc. Let people make their own choices instead, and just don’t put the onus on the rest of us to fix the problems of those choices. Banning smoking in public is acceptable because it’s no longer a choice that only affects yourself; it affects anyone near you in a really terrible way. But taxing cigarettes (or anything else) is no solution.