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
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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.
6 points