Source: Life magazine - December 7, 1936
I think i have seen this ads somewhere with same catch phrase.
Found, this is it https://sh.itjust.works/post/21718706
this post was submitted on 08 Jul 2024
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Vintage and Retro Ads, Promos, Fliers, Etc.
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And from John Hopkins study: Smoking and the Digestive System
First sentence is "Smoking can harm your digestive system in a number of ways. " :)))))
So, camel either put on false ads, or they are doing low quality reasearch and think it is correct.
False ads. Marketing just made shit up according to what people were worrying about at the time.