How I Met Your Mother Episode 5.11 Last Cigarette Ever

Robin is excited when she's assigned a new co-anchor at work, the hard-hitting and legendary newsman, Don Frank. Robin quickly realizes Don Frank is not the consummate professional she thought he was. Instead, he's a washed up, bitter man who seems perfectly happy to take Robin's professionalism and career down with his. Meanwhile, Marshall, driven by his own stress at work, gives into an old vice by bumming a cigarette from Robin. In a domino effect, the entire group (who we learn are all former smokers) gets re-addicted, and must try to quit all over again.