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.

Hamm and his former costar John Slattery marked 10 years since the series' finale with a panel at ATX TV Festival and shared some behind-the-scenes secrets

The location of where 'Mad Men' was shot had a huge impact on Jon Hamm and all of those fake cigarettes that the character of Don Draper smoked.