OMG, they let someone on oxygen SMOKE?
I was in Nevada this summer, and I saw quite a few folks dragging their oxygen tanks around with them. On one occasion a fellow tried to light up (smoking is permitted in the casinos). Thank God, a security guy, seeing the oxygen tank, asked him to put it out.
I remember my great grandfather being in a hospital/nursing home (I forget which) when I was a little girl and he smoked while on oxygen. Even at the age of 5, I thought it was strange.