Do you always say ‘bless you’ or some kind of salutation when someone around you

I have noticed over the years I do say this to almost everyone when I am within earshot of hearing them sneeze. I have no idea where I picked this up from unless it was always said to me and I in turn felt it was the correct or polite thing to do. now it seems it is a must for me, like saying excuse me or Thank you. I looked up the history of this because you intrigued me and this is what I found. This saying came from Pope gregory as a real blessing in hopes of anyone sneezing did not catch the plague. Many cultures, even some in Europe, believe that sneezing expels the soul--the "breath of life"--from the body. That doesn't seem too far-fetched when you realize that sneezing can send tiny particles speeding out of your nose at up to 100 miles per hour!