are cigarettes bad for you, so why are they so cool? – Massachusetts Daily Collegian Gen Z and Cigarette Smoking
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Though the ad would ignore it just for the sake of the metaphor

I only want Marlboro, or Joe Camel--hes cool, Rodriguez said

Their beliefs fly in the face of germ theory, the more than 150-year-old scientifically accepted idea that some diseases are caused by pathogenic microorganisms

In this blog, well explore the effects of tobacco on teeth and share some useful tips on what you can do to protect your smile
WHO report on the global Tobacco epidemic, 2017: monitoring Tobacco use and prevention policies

In terms of what it actually does: my mom stopped smoking (2 packs a day) for all pregnancies