In the past, Ananda was used to being in the forest. When they meet at midnight, they are hungry ghosts who are covered in fire and encounter great embarrassment (Guanyin Bodhisattva incarnation). Tell Ananda: in three days, your life will eventually fall into our class, but there are ways to save it. If you can give the six gods through diet and provide us with three treasures, you can increase your fortune and prolong your life. The next morning, Ananda told the Buddha about it, so the Buddha read the Dalagni mantra and said diet therapy. So that several groups of food stained with Ganges sand can get six clean roots, that is, get rid of all kinds of suffering and live a good life. So Ananda extended his life span by 120 years.

Another way of saying it is:

During the Lotus Peanut Age in Tibet, it is said that Buddhism was introduced to Tibet more than 600 years ago. At that time, King Chisong Dêzain of Tibet wanted to build a temple to promote Buddhism. The temple built during the day was destroyed by monsters at night and could not be built for a long time. So the king of Tibet sent a great Kampo named Botisatu to India to invite a powerful lotus master. At that time, everyone thought that even the master would fight against monsters, but after he came to the local area, he collected the best five kinds of Gan Lushu and other things to make cigarette offerings, including bodhi trees, white sandalwood, wild Artemisia, frankincense, Selaginella and other trees, as well as some delicious and beautiful things. Burn all these beautiful things at night, and at the same time, with the help of Buddhist scriptures, support these monsters with pious hearts, and finally get the demons. And this temple is the first temple in Tibet → Sanye Temple. Later generations inherited this method as the best way to remove obstacles and increase happiness. Because all sentient beings flow around the six paths because of ignorance of karma, it is difficult to suddenly realize their true colors. Through the method of offering cigarettes, we accumulate the merits and demerits of supporting the three treasures every day, and guide them to the pure land of the West and return to the Pilu Sea at the end of their lives. Moreover, the daily supply of cigarettes helps all sentient beings, which is of infinite benefit to the hungry ghost road, the hell road and the yin body. Its merits and demerits can help practitioners to lift the grievances of the ages and make obstacles. It is an extremely important practice course for tantric school to quickly eliminate the obstacles of knowing worries and others, quickly accumulate two kinds of resources, and successfully practice the method of offering cigarettes to achieve enlightenment. Based on the enlightenment of many reincarnated living buddhas, practicing cigarette offerings can gain the following eight benefits: (1) eliminating old enmity; (2) Cancel all transactions; (3) gain merit quickly; (4) feel rich and get rewards; (5) recovery from illness; (6) Torong holds the heart of the land; (7) local luck; (8) quickly prove the Buddha's fruit. Because practicing cigarette offerings has the above-mentioned extraordinary benefits, people who study Buddhism should practice diligently every day until they become Buddhists. Because of the vast compassion inspired by practicing cigarette offerings, we can achieve Buddhism. Otherwise, it will affect the study of Buddhism because of generations of debts, doubt Buddhism because of the troubles of relatives and creditors, and even regret charity and various good deeds and practices. Therefore, people who study Buddhism should think about the true meaning of Buddhism with a pure heart and understand the order of studying Buddhism, so that they can seriously face the debt of destroying past lives, make this world and even the future world more and more smooth, and finally get rid of the pain of reincarnation.