The 41-year-old actress portrays the attorney in hit television show American Crime Story: The People vs. O.J. Simpson. Rarely is she in a scene without a nicotine stick in her mouth, and Sarah admits she became slightly hooked on the habit while filming.

"I don’t smoke at all in life so that was something… I put it in my mouth and inhale it," she said during an appearance on The Late Show with Stephen Colbert on Thursday night (31Mar16). "When we first started I was coughing a lot and eventually I was like (taps the table impatiently) ready for a smoke. I was like, ‘Hey, hey’. It got me a little crazy for the ciggies.

"I smoke on American Horror Story too and I was shooting them at the same time so it was a real situation."

The People vs. O.J. Simpson also stars Cuba Gooding Jr. as O.J., John Travolta as Robert Shapiro and David Schwimmer as Robert Kardashian.

It has become a hit worldwide, but Sarah admits she will be bingeing on the box set when it's over as she's not currently watching it as it airs.

"I'm not watching it. I’m like the only person in America not watching it," she said. "I'm going to wait until it’s all over… I’m too selfish. I just want to wait and watch myself!"

Marcia was instrumental in pushing for a conviction for O.J. for the murders of his ex-wife Nicole Brown Simpson and waiter Ronald Goldman. Her determination in the case is clear to see through Sarah's portrayal of her, but the actress is annoyed that Marcia's passion is seen differently because she's a woman.

"She was a kind of strident, really aggressive attorney, and I also feel like if she was a man, these would all be positive ways to describe a man."

Referencing her less than flattering haircut and costume, Sarah added: "No-one would talk about his bad suit and his bad hair…"