Two of several odd facts:
Cary forced his 4th wife, Dyan Cannon to take LSD with him.
He contacted Good Housekeeping, hoping to write an article on promoting LSD use as therapy.
When 9 years old, Cary was told by his Dad, that Cary’s mom was taking a vacation. His father later told him, she had died. 30 years later, Cary got a letter. His Mom was still alive! She said she had been committed to a hospital by Cary’s father. He reunited with his Mom, but it was never that close. Too much had happened.
LSD was seriously bring looked at for treatment of depression, and possibly other things decades ago. I assume studies went poorly...