Fireball whiskey has anti-freeze in it and is consumed by a significant portion of the American population before their prefrontal cortex is fully formed.
On a slightly more serious note, some time in the future psychologists and anthropologists will study the history of the American populace and almost certainly find out that the inability of life expectancy to keep up with comparable countries is due to the fact that an appallingly large percentage Americans can’t afford to do anything or go anywhere for leisure.
Americans are going to eventually end up like those completely healthy lab rats whose life expectancy is like 50% that of the control group simply because the American rats have no enrichment in their enclosures.