On Monday, March 3, 2014 12:28:52 PM UTC-5, Dan Marotta wrote:
Even if the movie had only young and beautiful models, they'd still be using
oxygen...

The point is understood and well taken from gotovkotzepkoi.
If young, beautiful people were shown breathing oxygen (and some quick explanation was given as to why) then the public would accept that and ignore the tubes. When they see an old geezer with a tube up his nose, they automatically think they are on oxygen because they are old!