The Environmental Protection Agency (EPA) on Secondhand Smoke About this site: It's pretty obvious that smokers harm their lungs by lighting up a cigarette. But the facts may still seem cloudy when it comes to secondhand smoke. If you've ever wondered how the smoker next to you might affect your health, this is an excellent site to check out. The EPA defines secondhand smoke, offers clear facts on their health effects, and lists steps to reduce exposure. (http://www.epa.gov/iaq/ets/)   Pluses: The steps to reduce exposure are simple to follow and will make smokers and non-smokers alike aware of ways to help keep confined air clean.   Minuses: Meant for homeowners, this site mostly provides information on secondhand smoke in residences rather than public places.   Best feature: Fact sheets on the health effects of passive smoking offer conclusive evidence to help you convince your neighbor to stub out that cigarette.

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