The very famous scene at the end, which everybody remembers:
The famous cigarette trick occurs in a tale of love between Charlotte Vale (Bette Davis), a middle-aged, withdrawn spinster from a wealthy Boston family who is transformed from an ugly duckling into a beautiful, self-assured woman, and a handsome, unhappily-married, suave European named Jerry Durrance (Paul Henreid). During a South American cruise, Charlotte discovers life and love when she meets him and they fall in love and have an affair. In their famous scenes, cigarette smoking becomes a sensual act. In the final scene of the film, he asks Charlotte once more: "Shall we just have a cigarette on it?" She responds breathlessly: "Yes, sir," holding out an opened cigarette box. He takes two cigarettes and puts them in his mouth, lights them both, and then hands one over to Charlotte. The film ends with Charlotte's most memorable line on the balcony. Although she knows Jerry will never leave his wife, they have found something far more enduring and happy: "And just think, it won't be for this time only. That is if you'll help keep what we have. If we both try hard to, to protect that little strip of territory that's ours...Oh, Jerry, don't let's ask for the moon. We have the stars." As the music swells, the camera moves between them and ascends above the trees to a starry night sky.
Another IMDb comment that I found interesting. It has been quite a few years since I have seen this movie, so I don't think I ever interpreted it this way...may be time for another re-watching.
Irving Rapper, one of Hollywood's gay directors, could not have made a gayer film than this and my view is not controversial: Hollywood did not allow overt films about homosexuality back then, unless the man was a fop and a much secondary character meant to be the butt of fag jokes. Writers and directors alike decided to somehow incorporate a gay element without making it clear off the bat and devised stories that were strongly symbolic in nature. And while Olivia Higgins Prouty's novel was not intended to be interpreted as such, her quoting of Walt Whitman's "Now voyager, sail forth to seek and find" is interesting when Whitman himself was homosexual. Plus, the added element of Charlotte Vale's damaged persona by her mother who forced her into total repression -- something very close to many gay men and women -- and her ultimate transformation into a complete person due to her inner strength has also been a recurring gay theme.