[Intermernet]

The effects of smoking, Fracking, DDT, asbestos, global warming and junk-food have all had industry campaigns defending them. The only one in your list that hasn't is lack of exercise. This isn't to say that everything is a conspiracy driven by industry, but to illustrate that popular belief is often driven by popularist campaigns.

I would say that truth doesn't change belief, and unfortunately, it's belief that people act on.