Season 7, Episode 24: "The Invitations"

What are you doing?

Since when do you smoke?

I've always smoked.

-I've never seen you smoke. -Oh, yeah, well, big smoker.

I gave it up for a while, but it was too tough.

You know, I don't got the willpower.

-Oh, I don't like this one bit. -Well, I can't stop now.

I'm addicted. They've gotten a hold on me.