The harm of “first-hand smoke” and “second-hand smoke” is known to many people, “first-hand smoke” is the direct smoking people, “second-hand smoke “that is, non-smokers but passive smokers, people affected by smoking people, then what is “third-hand smoke”? Third-hand smoke refers to smokers “after swallowing” residue in clothes, walls, carpets, furniture and even hair and skin and other surfaces of tobacco smoke residue. Researchers in the United States found that these residues can exist for days, weeks or even months. They evaluated the reaction of nicotine in indoor environments after exposure to common airborne substances and found that nicotine can form powerful carcinogens when reacted with the common air pollutant nitrite. Indoor nitrite comes primarily from gas appliances. Toxic ingredients contained in third-hand smoke include hydrocyanic acid, butane, toluene, arsenic, lead, carbon monoxide, and more than a dozen highly carcinogenic compounds. Third-hand smoke is bad for health because it contains heavy metals, carcinogens, and even radiation, and children are more vulnerable to “third-hand smoke”. Because children’s weight is relatively low compared to adults, the same level of toxic substances can cause more harm to children. Because of their activity characteristics, they are more likely to be exposed to harmful substances left in the environment at close range. Because the immune system of infants and children is more fragile, they are more likely to be exposed to the hazards of “third-hand smoke” when they crawl or play on the floor or carpet. etc. Therefore, simply isolating children from the smoke produced when smoking does not really protect them. Even when smoking outside, nicotine levels in infants from smokers’ homes are still seven times higher than in infants from non-smokers’ homes. Combined with the fact that children are in a special period of growth and development, their resistance to harmful substances is much lower than that of adults. Therefore, the environment of tobacco residues, the children’s nervous system, respiratory system, circulatory system, etc. can cause considerable harm. 1, ashtray put tea crumbs to remove the smell of tobacco: after the family gathering, the room is often filled with a strong smell of nicotine. Ashtray is an important source of “third-hand smoke”. And tea has a strong adsorption effect, can effectively absorb the taste of cigarettes, the adsorption of indoor air particles of dust is also very strong. Will drink the leftover tea dregs dried, pinch a little placed in the ashtray, you can remove the harmful smell and particles in the cigarette. 2, orange peel in addition to smoke has a miraculous effect: similar to the role of tea and orange peel, is also a good choice to remove the house or ashtray in addition to the smell of smoke. Orange peel can be placed directly in the ashtray to eliminate the smell of smoke indoors. If the smell of smoke at home is too heavy, you can also light a few candles, candles burning carbon, can also adsorb the smell of smoke in the house, can effectively eliminate indoor “third-hand smoke” as soon as possible. 3, less contact with people who smoke: smokers have “third-hand smoke” on their clothes, skin and hair, once in close contact with it, will inevitably bring damage to health.