Too Old?

BobR writes:

Your knowledge of this subject is so seriously limited that you really
need to drop out of the discussion before you make yourself look
really stupid. The people of Peru who live at high altitudes have
become acclimated to the altitude and are not as subject to altitude
sickness as those who live at lower altitudes.

Beyond a certain altitude, human beings can never adapt fully to the thinner
air.

Smoking has the direct
effect of diminishing the ability of the lungs to absorb oxygen which
becomes especially critical at higher altitudes.

Yes.

Smokers who are not
acclimated to the altitude and who take off from lower altitudes and
asscend to altitude can easily become oxygen starved resulting in
numerous possible medical problems.

Yes.