Even with "fully legal products", courts have taken a more expansive view of public nuisance laws recently. https://www.washingtonpost.com/news/powerpost/palom

Even with "fully legal products", courts have taken a more expansive view of public nuisance laws recently. https://www.washingtonpost.com/news/powerpost/paloma/the-energy-202/2019/09/03/the-energy-202-here-s-why-lawyers-suing-oil-companies-are-following-the-opioid-cases/5d6d4c86602ff171a5d7338f/ https://www.washingtonpost.com/news/powerpost/paloma/the-ene... Also the SCOTUS effectively sent a number of these cases back to state courts this week, solving any jurisdictional issues for now. Of course, the newest wave of these cases are still very new (and more are likely coming soon) and have yet to be litigated outside of jurisdictional issues.