Little Shop of Horrors

Seymour Krelborn (Rick Moranis) and his colleague, Audrey (Ellen Greene), work at Mushnik's Flower Shop, lamenting they cannot escape the slums of New York City, living in a run-down, rough neighborhood referred to as "Skid Row." Struggling from a lack of customers, Mr. Mushnik (Vincent Gardenia) prompts to close the store, only for Audrey to suggest displaying an unusual plant Seymour owns. Immediately attracting a customer, Seymour explains he bought the plant, which he dubbed "Audrey II", from a Chinese flower shop during a solar eclipse. Attracting business to Mushnik's shop, the plant soon starts dying, worrying Seymour. Accidentally pricking his finger, he then discovers Audrey II needs human blood to thrive.
Audrey II continues to grow rapidly and Seymour becomes a local celebrity. Seymour soon attempts to ask Audrey out, but she turns him down because she has a date with her sadistic, mean-spirited dentist boyfriend Orin Scrivello (Steve Martin). Despite this, Audrey is interested in Seymour, as well as dreams of marrying him and escaping Skid Row. After Seymour closes up shop, Audrey II (Levi Stubbs) begins to talk to Seymour, demanding more blood than Seymour can give. The plant proposes Seymour murder someone in exchange for fame and fortune: Seymour initially refuses, but agrees upon witnessing Orin beating Audrey.
After Orin was finished with his patient, Arthur Denton (Bill Murray), who requested "a long, slow, root canal", Seymour books an appointment with Orin and arms himself with a revolver: however, he cannot bring himself to use it. Orin, who abuses nitrous oxide, puts on a type of venturi mask to receive a constant flow of the gas. Accidentally breaking an intake valve and unable to remove the mask, Orin begs Seymour for help removing it as Seymour just stands there. When Orin asks Seymour what he ever did to him, Seymour coldly replies, "Nothing, it's what you did to her." Orin dies from asphyxiation and Seymour drags his body back to Audrey II. While dismembering the body for the plant, Seymour is unknowingly witnessed by Mushnik, who flees in fear.
After feeding Orin's parts to Audrey II, Seymour discovers the police investigating Orin's disappearance. Audrey, feeling guilty about wishing Orin would disappear, is comforted by Seymour and the two admit their feelings for each other. That night, Mushnik confronts Seymour, about what he saw, and is prepared to report him to the police for the murder of Orin, but then Mushnik changes his mind and tells Seymour that to avoid getting arrested by the police, he would give Seymour a 30 to 40 year vacation and that Mushnik would take care of Audrey II in Seymour's place, Seymour backs Mushnik towards the plant while giving false tips about the plant and Mushnik is eaten by the plant.
Despite widespread success, Seymour worries about Audrey II's growth and unstable appetite. Offered money and a contract for a botany TV show, Seymour plans to escape Skid Row with Audrey using the money, leaving the plant to starve. After Audrey accepts Seymour's marriage proposal, Audrey II catches Seymour leaving and demands another meal: Seymour agrees, but insists on meat from a butcher. While Seymour is gone, the plant calls Audrey, coaxes her into the shop and then tries to eat her. Seymour, returning in time to save Audrey, escapes the store with her. Explaining that he fed the plant to become successful and win Audrey's heart, Seymour discovers she has always liked him. Approached by an executive from a botanical company named Patrick Martin (James Belushi), Seymour is offered a contract to breed Audrey II and sell the saplings worldwide. Seymour then realizes he must destroy Audrey II and the plant's plans for worldwide domination.
Confronting Audrey II, Seymour learns the plant is in reality an alien from outer space. Trapping Seymour, Audrey II collapses the store, attempting to kill him. Seymour, trapped under debris, grabs an exposed electrical cable and electrocutes Audrey II, causing it to explode. Leaving the destroyed shop, Seymour safely reunites with Audrey. The two wed and move to the suburbs: arriving at their new home, which is the one seen in Audrey's daydreams, a smiling Audrey II bud can be seen among the flowers in their front yard.
Original ending[edit]
During production, director Oz shot a 23-minute ending based on the off-Broadway musical's ending. However, after audiences at the preview screenings did not react positively to it, the ending had to be rewritten and re-shot for the theatrical release with a "happier ending."[3]
In the original ending, Audrey gets a call from Audrey II and goes to the shop. Audrey II tells her it needs a drink, then tells her to join Orin and Mushnik inside the plant and tries to eat her. Seymour enters and rescues Audrey but she is fatally injured. As she is dying she tells him what the plant said about Orin and Mushnik, and then Seymour confesses that he fed them to the plant. Audrey requests that Seymour feed her to the plant too, so that it will live and Seymour can earn the success he deserves. After fulfilling her dying wish, he attempts suicide by jumping off the roof of a building only to be stopped by Patrick Martin (Paul Dooley). Martin offers to reproduce and sell Audrey IIs, and has already grown a smaller Audrey II from one of the clippings that he harvested earlier. He also warns Seymour that his consent isn't necessary as plants are considered public domain. Realizing Audrey II is planning global domination, Seymour climbs down from the roof with the resolution to destroy the plant. Returning to the shop, he confronts and tries to kill Audrey II, who tears down the shop, fishes him from the rubble and eats him alive. The plant then spits out Seymour's glasses and laughs victoriously.
The three chorus girls appear in front of a large American flag and tell how although Audrey II buds became a worldwide consumer craze, the buds grew into an army of monstrous plants who begin to take over the Earth.[4] Giant Audrey II plants are shown destroying cities, toppling buildings, as well as eating people. The final shot shows the U.S. Army as it attempts to fight the buds as they ascend the Statue of Liberty.

Question: What does Orin abuse?
Answer: Nitrous oxide