Consider again the following statements and then decide if you really want to stop your grandma's humming:
"Humming . . . reduces the number of thoughts that fill your head. When you are humming there is no room for over thinking."
"Humming is naturally calming and refreshing for the mind."
"Humming can greatly increase oxygenation and blood flow not just in the sinus cavities by also in the brain and elsewhere in the body."
"Humming a childhood song can be a means of reminiscing on happier times."
In addition, more than 700 people who read my article responded to the poll that they hum daily.
I've started humming too. I pray that my children and grandchildren never try to make me stop.