You know what the #1 cause of heart conditions and high blood pressure is? Stress and fear. It takes a major toll on the body. One of the causes of obesity is a continued stress reaction. Ever think that Big Brother plants these stories so people will be stressed, live in fear, and thus be weaker and more less able to resist? I mean, a government that has the power to spray chemicals on you with no recourse on your own.. you are powerless.. all you can do is look up and hold your breath...
The story has far more ability to control the masses than actually 'spraying' them with chemicals. You are falling right into Big Brother's hands passing this along..
Oh, wait....never mind. That wasn't me; it was someone I read about in a book.