It seems that smoking came full circle at the end; He walked out on one job due to it and smoking secured another!
Smoking came full circle didn't it? Ironic, at the start of the movie the smoking scene made him walk out of his career and requesting the smoking section at Bridges' restaurant restored it! Isn't it funny how smoking came back into play from the beginning to the end? It's like it was a book-end when at the beginning of the film, he was working for a man who is a chain smoker, and all of his technicians are smokers too and they want to create Pudgy the smoking parrot which Daniel walks out on, and at the end as Mrs. Doubtfire and as Daniel, he gets a meeting with Mr. Lundy who is a nonsmoker and won't eat in the smoking section; so as Mrs. Doubtfire he has to request the smoking section so as to save his career and it's similar to the episode of Friends where Rachel has to smoke in order to be included in all aspects of her job and save it, but unlike Friends, where Rachel actually does have to smoke on screen, two, three cigarettes tops, The Late Robin Williams never had to smoke a single cigarette in this film he just had to either be fully against it at the start or act like he could temporarily tolerate it, like it, used to smoke to get a job at the end of the film. The Late Robin Williams guest starred on an episode of friends with Billy Crystal by the way.