I stand by my claim that you and I should not have to research the health impacts of, for example, microwaves. We should have to think about it, but if you have a basic understanding of how they work and how to use them safely, and you listen to people who might tell you if there were an issue (friends, the news, the FDA, etc.), then that is enough. And when I say "how to use them safely", I don't mean doing your own experimentation to find the limits of the device. I mean being told not to put metal in it, maybe watching a video to see what happens if you do, and accepting that it's a bad idea and you won't do it. It is not possible for me to do a medical study on the impacts of eating microwaved food, but I have enough societal trust that I continue to use them anyway.
It is obvious to me that smoking is bad for you, it feels like an intuitive fact that nobody should have to be taught, but that's because I grew up in a culture absolutely saturated with that idea, and I didn't know anyone that smoked. Somebody who grew up 70 years ago in the complete opposite culture can't be blamed for not knowing at the time that smoking causes lung cancer. How could they know? Nobody can follow cutting-edge research from every field on the planet and adjust their life accordingly. Even if you could it wouldn't help - cutting edge science is often contradictory and it takes time for a consensus and convincing body of evidence to build up. I'm sure both of us hold intuitively obvious beliefs that we'll realize are wrong in 20 years.
What is the solution? It's not helpful to wait until after a coverup is exposed and then blame every individual who didn't somehow figure it out on their own. You also can't just believe the opposite of everything you've ever been told - you'll have the same problem. Some things that corporations produce are actually good for you, lobbyists are occasionally paid to promote something useful and true. Your parents were probably right about a lot of stuff they taught you. You can and should ask questions and learn as much as you can, but life is complicated, nobody can be deeply educated about every single thing they touch.