Big companies like tobacco companies, chemical companies, and pharmaceutical companies can try to make people doubt that the science about their products is true. They do this by paying for studies, giving out false information, making advertisements, and using other tactics to sow doubt in people's minds about what scientists are saying about their products. This is called "doubt is their product."
When this happens, it can hurt people's health in a few ways. First, when people don't trust the science, they might not make the best choices for their health. For example, if people don't believe that a particular cigarette is bad for their health, they might smoke it more often and that could be bad for them. Second, if people don't trust the science it can make it harder for healthcare providers to give good advice on how to protect your health. Third, when people doubt the science, it can mean that governments won't pass laws that protect people's health because they don't think the science is trustworthy.
So it's important to be careful about what we believe when big companies are trying to make us doubt the science. We should look for independent studies and make sure that we are making the best decisions for our health.