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"Shortly after the female nurses arrive on the submarine there's a scene where the attractive O'brien's character is about to be caught by Cary Grant's character... so she hurriedly puts out her cigarette in his cup of coffee. I only caught the tail-end of the scene so (unfortunately...) can't document whether she lit up or took drags or not on camera... What I know for certain, however, is she DID smoke it since Grant, after discovering it (in all his charm), begins making jokes about drinking his coffee and having a cigarette in the morning as routine or something.