The most famous has to be the Now Voyager (1942) ending; Bette Davis' character Charlotte Vale is handed a lit cigarette from Jerry Durance (Paul Henreid). WOW!
Frank Sinatra made his directorial debit with the (1965) war film None but the Brave.
A platoon of Japanese soldiers are marooned on a pacific island with no means of contacting the outside world. An American plane carrying US soldiers crashes on the island and a truce is agreed in which each group inhabits one side of the island. A Japanese soldier who is skilled at spear fishing leaves some of his catch on the beach, these are collected by a US soldier who leaves American cigarettes behind in exchange.
There are a large selection of vintage sexist smoking adverts but this is my favourite.