Thank you for raising awareness about this very important and determinant factor!!
And not only placebo.
I’m our times we all have witnessed how mass psychosis is created by just some “specific way” to broadcast news - and manipulate people’s perception.
What ensued as a “pandemic” was the NOCEBO effect after repeating in the news horrible things, hopelessness and the whole list of symptoms that people started manifesting in their experience out of fear and faith in whatsoever is fed to them through mass media and governmental propaganda.

Very good post! Thank you!!!!