I would think some people are more easily suceptible to it than others, but I don't doubt there's plenty of suckers too
One thing I remember is suddenly everyone has asthma... young kids who were in fact perfectly healthy... I remember as a kid climbing a mountain with one.. If I was ahead because there was something I wanted to see, he'd whine to stop because of his asthma, but if he was ahead, he was doing perfectly fine... Allergies are another one.. Yes, some people have them, and they are serious, but what's with all these lactose and gluten allergies all of a sudden.. I mean it took only 5 years of clever marketing to make people think they have this sickness... besides the point, they aren't allergies, but maybe intolerances.. which are different