When the younger cast told Hamm they "wanted to feel" the burn of real cigarettes, the series star joked, "Let me know how that goes."Mad Men was built on three things: Jon Hamm, excellent writing, and a mountain of fake cigarettes.

Mad Men, which won 16 Emmys, starred Hamm as protagonist Don Draper, the Creative Director of a New York advertising firm at the heart of the series. Slattery played Draper’s colleague, Roger Sterling. Together, the two — and their cast members — slugged dozens of martinis and puffed hundreds of cigarettes throughout the show’s seven seasons.

Jon Hamm recounted having to smoke so many fake cigarettes and drink onion water 'vodkas' on 'Mad Men': 'Oh, the breath was lovely!'