Would "Casablanca" have been rated XXX?
Depictions of smoking in movies will now be a factor when deciding what a film's rating will be, possibly making a PG-13 movie R-rated, the Motion Picture Association of America said yesterday. The policy affects only new movies.
Along with violence, depictions of sex, adult language and other content considerations, ratings organizations will examine new releases to determine if they glamorize smoking or if it is pervasive through the films, even among adults. Underage smoking has always been considered when rating a film.
Put It Out, Shweetheart - washingtonpost.com