Cigars in movies are more than just a prop. They have dominated the scenes of movies for decades, adding that little bit of drama or sophistication to any film that includes them. Rightly so because...
Very similar to the Movie Goodfellas, there’s a lot of improvisation between the actors. Often during shooting, Martin Scorsese would tell De Niro and Pesci where to start and end. The rest was up to them. With this in mind, the number of profanities used is less surprising.
Two other Scorsese films outrank Goodfellas when it comes to this specific profanity: the word is dropped 422 times in Casino (no. 7) and a whopping 506 times in The Wolf of Wall Street (no. 3).