I had not even been thinking of the really nasty forms of altitude sickness. My limited experience confirms what cpach said. The worst is pretty mild sickness, nothing life threatening unless you compound it in very stupid ways. If the mountians in AZ don't put a major climb between you and your bed you would have ot make very bad decisions on the road and get very unlucky to have real danger (other than mercyless teasing if yuo talked to much before starting and fail).