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What’s the actual difference between a cancer cell and a normal cell, aside from the fact that cancer cells don’t kill themselves? Is cancer from a cow transmissible to humans?
People knew the effects of tobacco for centuries, actually. But also, it became widely known as soon as it started being widely investigated. I have the same argument about vapes all the time. Within like 2 years cigarettes went from being something prescribed by doctors to something that everyone knows gives you cancer. When something is as heavily scrutinized as vapes or lab-grown meat, you can be damned sure the effects will be widely understood within a couple of decades
https://en.m.wikipedia.org/wiki/A_Counterblaste_to_Tobacco
Some doctors may have been wrong, but that doesn’t mean nobody knew cigarettes were dangerous. I’ll save my time and assume that if you’re this unabashedly wrong about this, you’re probably as unabashedly wrong about everything else too