Back in the old days in high school, we did this experiment in biology lab. A cigarette smoke was passed through a bottle with a live goldfish and then we could see how its gills turn black. It was supposed to show us that smoking is bad, it had no effect on students decisions of course. I don’t think they are allowed to do such experiments these days.

Can’t get lung cancer if you don’t have lungs!

@ObviouslyNotBanana That is a puffer fish, yes?