I am a smoker, I'm ashamed to say. I had given it up for many years, then picked it up again. It's a horrible habit. I struggle with myself all the time. And I love to smoke. An actor has to be very, very careful, as one of the most wonderful props - and actors love props - is a cigarette. There's so much to do with it: you can bring it up to your face, play with the smoke. It's just the greatest - ever since I was 16 and in acting school in England, I've been playing around with cigarettes.

As actors, emotion is the sand in the sandbox for us. Without emotion, there's nothing to play - and we are playing. We know that. Whether you think we do or not, we know that.

I think the funny thing about acting for me - and I hold it in a very holy, spiritual way - not to be overly fundamentalist about it, but it's that important to me - is that it is an ancient healing art.

It becomes more and more popular to call actors who play characters "character actors." But I've always been somebody who is much more invested in who I am playing than how they look.

It's not exactly an interview that's going on [in documentary]. I guess we do ask Edward Snowden some questions and we're recording him answering them and so on like that.

The climate informs the character.

"I'm going to show you I haven't given you permission because clearly you're not grown up enough to understand that, not having given you permission, you can't just come look in my house." And I won't know if they're coming and looking or not... so I put a piece of tape over it.