Previously used cars could not confirm smoking cessation and smoking, and the smell of cigarettes soaked in seats and air conditioners after purchase was very strong, and it cost a lot of money to deodorize. Also, because we wanted to keep the initial cost low, we prioritized low vehicle prices, so there were so many defects and failures after purchase that it cost us a lot to repair costs. In the future, I learned about purchasing used cars. The main reason for considering the transfer was the smell inside the car, frequent breakdowns, and maintenance costs.