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Smoke is a cloud of very small, solid particles that is made when something is burned with a flame, such as wood or paper.

Smoke can be bad because if it goes into the lungs of a person, it can hurt their lungs or even kill them (for example, in a house fire). Most people think that they are always able to see smoke, but people cannot see some types of smoke: they are invisible.

Smoke from tobacco

When people smoke tobacco in cigars or cigarettes, they are burning the tobacco and inhaling the smoke. Tobacco smoke can hurt the mouth, throat, and lungs. It can cause mouth, throat, or lung cancer. It can also cause emphysema and bronchitis (trouble breathing).

Smoke from factories

Factories and power plants produce large amounts of smoke into the atmosphere which pollutes the air. Eventually the toxic chemicals in smoke fall to the ground, and then they pollute the soil and the water. When the air, soil and water are polluted with toxic chemicals, the chemicals also get absorbed by plants and animals (including humans).

Smoke from Dry ice

When Dry ice is put into water, it creates smoke, also. Dry ice is used for theatrical needs, and for places that need illumination.

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