From climate change to smoking and cancer, this is the story of how doubt has been manufactured. This 10 part series will explore how powerful interests and sharp PR managers engineered doubt about the connection between smoking and cancer and how similar tactics were later used by some to make us doubt climate change. With the help of once-secret internal memos, Peter Pomerantsev takes us behind boardroom doors where such strategies were drawn up and explores how the narrative changed on one of the most important stories of our time - and how the marketing of doubt has undermined our willingness to believe almost everything.