For years and years, executives from Big Tobacco all over the world perpetrated the myth - always with a straight face and often on oath - that smoking was neither addictive nor harmful. But Tara Brown has just done an interview which will surely take your breath away. It's with a current, senior scientist at British American Tobacco who finally admits what we have all known for a long time. Smoking kills. No, he doesn't have a gun held to his head, but he does have an agenda. He wants to promote nicotine e-cigarettes, or vaping as it's also called in Europe and America. And guess what? It is safer than tobacco … but does that mean it's really safe?

Reporter: Tara Brown
Producers: Nick Greenaway, Eliza Berkery