Jennifer Aniston is trying to break up with her nicotine habit. The Friends star has cut out cigarettes and eliminated caffeine, too!

Dirt actress Laura Allen (who hung out with Aniston, 38, and Courteney Cox, 42, when the two shot their much-talked-about lesbian kiss in January) tells Us Weekly.

“Jen was doing a total cleansing,” says Allen, 32, who adds that the actress “did a lot of yoga to stop smoking.”

“Between takes, it would have been tempting to go outside and have a cigarette. Instead, Jen was clinging to Courteney. She said how hard it was.”

And cigarettes weren’t the only vice on the actress’ mind.

“I had a Diet Coke on-set, and she was really jonesing for it,” Allen adds.

So did Aniston’s pent-up stress make for a more passionate liplock (scheduled to air March 27)?

Evidently not. Says Allen, “Courteney has some steamy sex scenes. This was actually really tame.”

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