They didn't have a scientific proof that smoking was bad for you. Just like we don't have the proof that social media is awful for you and that Trump is a cult.

Cigarettes were recognised as the cause of lung cancer in the 1940s and 1950s, with the confluence of studies from epidemiology, animal experiments, cellular pathology and chemical analytics

https://tobaccocontrol.bmj.com/content/21/2/87

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