8,000 ft (2,400 meters) isn't particularly high. Millions of people live at that altitude. It's extremely common for people to go on a skiing vacation at that altitude or above, up to maybe 4,000 meters, and not need to take any particular precautions.
As to comments here about days resting while progressing to higher altitudes, such as in the Himalayas. A day or two will mostly result in adjustments in the water balance of your blood. It takes about 10 days to two weeks for your bone marrow to start producing additional red blood cells to compensate for the lower level of oxygen in the air.
High level altitude sickness is more complex and relates to multiple factors, including fluid balance, the health of one's vasculature and lungs, etc.
It is certainly the case that populations that have lived at high altitudes in the Himalayas or Andes for thousands of years have evolved adaptations that make such living easier.