[Frost1x]

No known pre-existing conditions.

The body is a large and extremely marvelous yet complex piece of machinery, even with self-repairing mechanisms.

Everyone is at risk even if they're healthy, it's just that the risk rates vary and for some groups are incredibly low based on the data. Knowing your risk rate is nearly impossible, but you can try to estimate based on how it effects larger subgroups of the population. That doesn't mean you're not at risk, it just means you're less likely at risk or were not measuring a risk factor you happen to be highly susceptible to.

Even run of the mill drugs have rare reactions that can lead to death. Across a large enough population and enough time, those rare reactions will occur. New unknown and unpredicted issues may even manifest.

People like to think in absolutes: I will die from this or I'm immune to this. Most of life isnt discrete (at least at our scale) and falls in some continuum between extremes.