What I'm trying to say, in a more abstract and philosophical way, is that it's important to be mindful that what we expose ourselves to affects our psyche, from the food we eat, to the space we occupy, to the conversations we have, to the company we keep. Some things are easy to quantify and measure, like lead in our drinking water. Some things, maybe not so much, like how office plants might affect our work productivity.
Studies like these are important and it's important to look at empirical evidence objectively, if we're to understand these kinds of ideas. I think these are complex issues though and we owe it to ourselves to learn and understand as much as possible. That said, just because something is hard to understand and seemingly immeasurable, doesn't mean things can't affect us. Just because Geiger counters and modern physics didn't exist in ancient China for example, doesn't mean radium would be any less dangerous to handle back then than it is now.
But I do understand your point, and you're right, I don't want to argue, so let's agree to disagree. :)