How much of the 20C Flynn Effect can be chalked up to 1. antibiotics and vaccines reducing disease load during development? 2. (eventual) reductions in environmental heavy metals? combined I bet its a lot
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2hs? You mean "doesn't seem like it has any detectable effects"? Hmm to be honest I don't know much about this. But if these claims that air pollution has that strong effects, then this tar from tobacco smoke could have an effect?
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Also, if nicotine works as a nootropic for adult brains, it is possible it could unfavorably disrupt developing brains. Hmm maybe even someone studied this on mice or something
End of conversation
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