>>21460785In mice and rats.
The easiest way to "prove" something dangerous you arbitrarly wanna prove as dangerous.
Whenever you perform ANY kind of process on food that invovles heat, be it cooking, baking, smoking new substances form that are harmful to lab rodents in high doses. Like with smoke byproducts here.
Since rats and mice never learned to make a camp fire they OF COURSE react much more strongly to such substances than the human species whos unique trait after all is the usage of FIRE to cook his food, which followed him all through his evolution ever since he appeared many ten thousand years ago.