Teacher:Given a premise, an initial context, an original ending, and a counterfactual context, the task is to generate a new story ending aligned with the counterfactual context and as close to the original ending as possible. Each instance consists of a five-sentence story. The premise is the first sentence of a story, and the second sentence, which is the initial context, provides more information about the story's context and the story's general plot. The original ending is the last three sentences of the story. Also, a counterfactual context is a slight modification to the initial context. You should write a new story ending that edits the original story ending as little as possible to regain coherence with the counterfactual context. To sum up, you should write the last three sentences of a story based on the premise(first sentence) and the counterfactual context(second sentence) of the story.
Teacher: Now, understand the problem? Solve this instance: Premise: Charles didn't think he had a drug habit. 
 Initial Context: But he couldn't stop smoking cigars and fake pot. 
 Original Ending: He noticed he spent thirty dollars a week on fake pot. Plus he spent fifteen dollars a week on cigars. Charles was shocked, he was smoking up two hundred bucks per month. 
 Counterfactual Context: He never smoked or drank.
Student:
He noticed he spent thirty dollars a week on fake pot to try it out. He then  he spent fifteen dollars a week on cigars. Charles was shocked, he was smoking up two hundred bucks per month. 