some people can't go to work after second hand cannabis inhalation
so... keep your pleasures for yourself

Yes, I agree. It's hard for me to do anything but sleep, and I'm sensitive to weed.
Also, often weed smells really bad. Dislike the smell just as much as stale cigarette smoke. Stale weed is possibly worse.

You know, "blowing smoke" is synonymous with bullsh*tting, right? Very on-point.
Soot and second-hand particulates are created when ANYTHING is burned or vaporized. Weed is NOT different.
In poor countries, people typically develop chronic breathing problems from imperfectly vented wood stoves. Recent research concluded that long-term exposure to traffic emissions causes emphysema, similar to a cigarette habit. People who live downwind of coal-burning power plants, have sky-high disease stats, largely (but not exclusively) because of airborne particulates, some of them radioactive. The WTC survivors and rescue workers have a multitude of health issues, with respiratory problems front and center.
There are even cases of neurological autoimmune disorder in slaughterhouse workers (pork) exposed to airborne pig blood and vaporized brain tissue. The particles were fine enough to get through their breathing masks. These people are permanently and severely disabled.

Regardless of what is being burned, anyone inhaling it second-hand is at risk. "All-natural" is irrelevant. Wood and dung are even more natural.
The only thing more natural still, is wilful human ignorance and fact-free, strongly held opinions, aka "truthiness".

Ahhhhh campfire. I’ll be dead early for my love of camping and enjoy a blaze. No regrets

that's a new one...lol