Due to the progress of science and technology, people have stepped up the development of mint products, and successively developed mint cigarettes, mint tea, mint pillows, mint baths and other products. Among them, menthol cigarettes sell well and are exported to Japan and other countries; Mint tea is also deeply loved by people and exported to African countries. This undoubtedly increased the market demand of mint leaves and mint whole grass, and the market of mint leaves and mint whole grass rose all the way. The price of mint leaves rose from 4-6 yuan in 2005 to 6- 10 yuan in 2006, and the export-grade high-quality mint leaves reached more than 12 yuan, so there was a fear of being out of stock. The whole mint grass also rose from 1.5-2 yuan in 2005 to 2.5-3 yuan in 2006. At the same time, the edible oil income of an acre of mint is only about 1000 yuan, while the income from selling leaves and grass is as high as 2000 yuan, and edible oil consumes time and coal. By contrast, who will cook the oil? Only when the market of peppermint oil rises above 200 yuan per kilogram will farmers consider cooking oil. In 2006, the purchase price of peppermint oil has reached per kilogram 120 yuan, and it is hard to buy.