I have some bad news for you. You do with every breath.
>They're known carcinogens
Depends on the mushroom. Many are actually anti cancer, but I'm going to to assume you meant breathing the spores. It's only a concern if you're in an enclosed space. Like a fruiting room full of oyster mushrooms.
>they could establish a latent infection. This is what fungi do.
Having a fungal infection isn't necessarily bad thing. YOU have a fungal community in and on you right now. They're protecting you even as you read this. It's been shown that inculating trees with chaga mushrooms can prevent infections from other more aggressive parasites and blights. Fungi are your friends. Oyster mushrooms aren't going to infect you. If anyone would, I'd put my money on cordyceps. And those aren't used for mycorestoration.
>We're already all encountering this on a day to day basis at a background level. No reason to increase exposure.
Gonna have to disagree. Humans are responsible for completely fucking the mycelial mass of earth. We knocked a big cog out of the carbon cycle through mass development of the land, mass use of pesticides, fungicides, and fertilizers. Pavement everywhere. And we absolutely need to fix it. Good news for you though, people are working on sporeless strains of fungi used in mycorestoration. Soon your worries will be irrelevant.
We're already all encountering this on a day to day basis at a background level. No reason to increase exposure.