Off the top of my head, fossil carbon, asbestos, and lead. HN discussed the last 2 months back: https://news.ycombinator.com/item?id=28500508 https://news.ycomb

Off the top of my head, fossil carbon, asbestos, and lead. HN discussed the last 2 months back: https://news.ycombinator.com/item?id=28500508 https://news.ycombinator.com/item?id=28500508 But the real question is how many times we don't hear about it. Many on HN are, like many executives, big on the duty of companies to maximize shareholder value. And this sort of manufactured doubt obviously increased shareholder value for a long period. So the real question becomes not "did anybody else ever do this" but "who wouldn't use a potent, cost-effective way to keep profits up?"