o..JI& •• '�LI.�: The effects of smoking aboard an airaaft may be even than smo on the ground. The reason: the extremely 10 humidity in the cabin air (the airaaft's air conditioning removes vir- tualIy aD the moisture) and the decreased oxygen content. Both, appai esItly, increase the amount that the smo er absorbs into his bloodstream. This increase is not dangerous, but docs slightly decrease the Care can be taken! WIth advanced pIan­ nearly the hazards of jet travel can controlled or, , minimjzwt. amount of oxygen the blood can carry, which in turn very. increases the rldoad of the heart.