Part of this is because the tobacco industry paid “experts” to confuse the issue, so more data had to be collected to demonstrate what everyone already knew.
https://en.wikipedia.org/wiki/Merchants_of_Doubt
Part of this is because the tobacco industry paid “experts” to confuse the issue, so more data had to be collected to demonstrate what everyone already knew.
https://en.wikipedia.org/wiki/Merchants_of_Doubt