Just search for the paper on the topic, written by the Phillip Morris Unbiased Research Group. it explains how frogs breathing air got more cancer then frogs tr

Just search for the paper on the topic, written by the Phillip Morris Unbiased Research Group. it explains how frogs breathing air got more cancer then frogs trapped in airtight boxes and only allowed to breathe exhaled tobacco smoke, who mostly died for other reasons. seems legit...