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Kids are particularly at risk for the effects of secondhand smoke because their bodies are still growing and they breathe at a faster rate than adults.It goes into the air, where anyone nearby can breathe it. But many people are still exposed to secondhand smoke, especially children who live with parents who smoke.Even people who try to be careful about where they light up may not protect those around them. Tobacco smoke has more than 4,000 chemical compounds, at least 250 are known to cause disease.The more cigarettes a mother-to-be smokes, the greater the danger to her baby.It's simple: Avoid being around people who are smoking, and try to convince those around you who smoke to quit.Exposure to secondhand smoke raises the risk -- by as much as 30 percent -- that others will get lung cancer and many other types of cancer, it can lead to emphysema, and it is bad for your heart.Smoke makes your blood stickier, raises your "bad" LDL cholesterol, and damages the lining of your blood vessels.Read more to learn about the dangers of secondhand smoke and how to create a smoke-free environment for your children.Secondhand smoke (also known as environmental tobacco smoke) is the smoke a smoker breathes out and that comes from the tip of burning cigarettes, pipes, and cigars. Many of these chemicals are dangerous; more than 50 are known to cause cancer.These conditions have been linked to secondhand smoke exposure in children: Smoking during pregnancy is especially dangerous to the developing baby.It's tied to premature delivery, low birth weight, SIDS, limited mental ability, trouble with learning, and ADHD.