Merchants of Doubt looks at the well established Public Relations tactic of saturating the media with shills who present themselves as independent scientific authorities on issues in order to cast doubt in the public mind. The film looks at how this tactic, that was originally developed by the tobacco industry to obfuscate the health risks of smoking, has since come to cloud other issues such as the pervasiveness of toxic chemicals, flame retardants, asbestos, certain pharmaceutical drugs and now, climate change. Using the icon of a magician, Merchants of Doubt explores the analogy between these tactics and the methods used by magicians to distract their audiences from observing how illusions are performed. For example, with the tobacco industry, the shills successfully delayed government regulation until long after the health risks from smoking was unequivocally proven. Likewise with manufacturers of flame retardants, who worked to protect their sales after the toxic effects and pervasiveness of the chemicals were discovered. This is all made analogous to the ongoing use of these very same tactics to forestall governmental action in regards to global climate change today.