Not sure whether it's a trick of memory or acclimation, but it seems that the last couple of episodes have been less smoke-filled. As Dick Whitman has been revealed, we seem to also be experiencing a "clearing of the air".

In the last episode when Peggy walks into Duck's hotel room she says "How much have you been smoking in here?" He replies, "Sorry about that..."

Ofcourse we know he's been watching info about JFK on TV...and smoking up a storm.

I bet they just got tired of doing all that.

The Sound of One Man Laughing:

I bet they just got tired of doing all that.

When the woman from Caldecott Farms says her husband died of lung cancer, the shot cuts immediately to Don lighting up. Maybe they're just taking an more ironic approach.

adbasham:

When the woman from Caldecott Farms says her husband died of lung cancer, the shot cuts immediately to Don lighting up. Maybe they're just taking an more ironic approach.

Yeah, that was subtlety worthy of Peter Jackson.