A pack of cigarettes a year isn’t going to have any appreciable harm. A cigar a month isn’t going to have any appreciable harm. A pipe every few days isn’t going to have any appreciable harm.

But all of those will improve the quality of one’s life, and thus improve one mental health.

I have a friend who has claimed, on multiple occasions, that soda pop protects your teeth because the acid kills the bacteria.

So, you know, these ideas are out there.