Smoking will lead to the low content of selenium in human blood, and selenium is an indispensable trace element for cancer prevention. Therefore, smokers should always supplement foods rich in selenium, such as animal liver, seaweed, shrimp, beans and so on. Followed by mushrooms, mushrooms, millet, tremella, garlic, day lily, sesame, whole grains, wheat, corn and so on. In addition, smoking will make the antioxidants and vitamins stored in the body consume rapidly, and the oxidizing substances in the body increase. If it can't be replenished in time, it will cause peroxide reaction. Therefore, smokers need to supplement antioxidant vitamins, such as carotene, vitamin C, vitamin E and so on. Vitamin C, in particular, is a water-soluble vitamin, also known as "ascorbic acid", which can effectively avoid peroxidation and reduce smokers' smoking impulse. In order to supplement these vitamins in daily life, we should eat more fruits and vegetables and less meat to create an alkaline physiological environment in the human body. Especially raw carrots and cucumbers are rich in antioxidant vitamins. At the same time, we should also pay attention to proper supplementation of vitamin B, calcium and magnesium, which will help to relieve stress and relieve anxiety and insomnia symptoms in the process of quitting smoking.