When the film's intertitles refer to "Nose-Powder" (in the prison refectory scene, when the guards are searching for a "Nose-Powder" smuggler, who then stashes the substance in a salt pot), are they referring to cocaine ? Was it common in society in the mid-30s ?
You would actualy be suprised how many hollywood stars back in the day did drugs like cocaine or heroine (though I'm not sure Chaplin was a user). They were probably bigger during the silent era, ya know with the huge party scene, but they were not that uncommon. There were quite a few ODs from heroine during the end of the 20's. During the 30's and 40's Tallulah Bankhead would say she was a user of cocaine and Billie Holiday, though she was not realy in the hollywood exactly, she overdosed on heroine in the 50's.
If you want to know about old hollywoods more seedy side you should check out books like "Hollywood Babylon", "Dishing Hollywood", or "Hollywood book of scandles".