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Re:We ignored evidence linking cigarettes to cancer – Let's ... by code_duck on Saturday February 16, 2019 @01:34PM (#19180113)
I don't research this professionally or as a hobby. Your googling would be as good as mine.
Re:We ignored evidence linking cigarettes to cancer – Let's ... by intopieces on Saturday February 16, 2019 @04:41PM (#19181110)
I tried to find evidence for your claim and could not. So, I downvoted you.
Re:We ignored evidence linking cigarettes to cancer – Let's ... by code_duck on Thursday February 21, 2019 @02:45PM (#19219901)
Gosh, that's personal. I'm going to assume you mean that you downvoted my comment.

Here, I found this after approximately 15 seconds of research

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4363846/

"Nicotine poses several health hazards. There is an increased risk of cardiovascular, respiratory, gastrointestinal disorders. There is decreased immune response and it also poses ill impacts on the reproductive health. It affects the cell proliferation, oxidative stress, apoptosis, DNA mutation by various mechanisms which leads to cancer. It also affects the tumor proliferation and metastasis and causes resistance to chemo and radio therapeutic agents. The use of nicotine needs regulation. The sale of nicotine should be under supervision of trained medical personnel."

The ease of locating this leads me to believe it would be simple to find additional support for the idea that nicotine is not entirely benign. I am not going to take the time to do this, even though that risks a downvote on HN.