ANo, there are many differences between what happened in real life and what was shown in this movie. Also, the real Jack the Ripper was never caught and it is very noteworthy that there are dozens of (by some accounts, over 100) theories about Jack's identity. Usually a movie about Jack the Ripper will show one person vs the other as the killer based on various evidence the filmmakers view as most valid. However, the characters of Frederick Abberline, Mary Kelly, Sir William Gull (Ian Holm), John Merrick (Anthony Parker), Martha Tabram (Samantha Spiro), "Polly" Nichols (Annabelle Apsion), Annie Chapman (Katrin Cartlidge), Elizabeth "Liz" Stride (Susan Lynch), Catherine "Kate" Eddowes (Lesley Sharp), John Netley (Jason Flemyng), and Queen Victoria (Liz Moscrop) are based on real individuals. Beyond that, the rest of the story is fiction.
AYes. "Chasing the dragon" refers to inhaling the smoke from heated morphine, heroin or opium that has been placed on a piece of foil. The 'chasing' occurs as the user gingerly keeps the liquid moving in order to keep it from coalescing into a single, unmanageable mass. "Chasing the dragon" as an ingestion method has been accomplished with various vaporizing apparatus, including traditional opium pipes, as depicted in the movie.