They also believed miasma (bad smells) spread disease. They weren't a million miles away from the idea of airborne pathogens, but they were obviously incorrect about sweet smells having protective properties.

That said, I've wondered if the flowers thing selected in favour of people with hayfever - if you're producing more mucus and expelling it, that might lower your exposure. I've never seen a study on it, though.

> that might lower your exposure. I've never seen a study on it, though.

You wont, the scientific community perfectly represent the Thomas Pynchon saying "'If they can get you asking the wrong questions, they don't have to worry about answers"

Besides (UK) Govt water quality legislation creates a massive health and cancer industry!

Makes a mockery of the so called intelligence of the law!