You've heard of the dangers of smoking and of secondhand smoke. But what about third-hand smoke?
Researchers define third-hand smoke as what's left hanging around after the smoke clears. Smoking releases nicotine into the air, and experts say it can cling to furniture, carpet, walls and clothing for months.
When the thirdhand smoke reacts with indoor air polluntants from heaters, it can form carcinogens.
Young children are most at risk. The study found opening a window or using a fan doesn't help.
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